Testicular Tumors: What Radiologists Need to Know—Differential Diagnosis, Staging, and Management

Optimal imaging techniques across the spectrum of testicular cancer

Over the years, several imaging techniques have been used in the diagnosis and management of testicular cancer. We compartmentalize disease stages into preorchiectomy, stage 1, initial stage 2 and 3 and postchemotherapy stage 2 and 3. We then elaborate on various imaging modalities that are relevant to each of these stages. We also describe evolving imaging tools that have shown promise. We attempt to provide a comprehensive review of these techniques over the spectrum of testicular cancer.

Diagnostic Approach to Equine Testicular Disorders

Management of breeding stallions is crucial to equine reproduction. The longevity of the breeding career is the ultimate objective, whether the stallion is used for natural cover or for semen collection and artificial insemination. Stud farm veterinarians should be aware of the techniques used to evaluate testicular function and the diagnostic approach to testicular disorders in cases of emergency. This paper presents the clinical methods used to evaluate testicular health, including palpation, ultrasonography, biopsy, and fine-needle aspiration. The discussion of testicular disorders is broken down into four categories: congenital disorders (cryptorchidism, monorchidism, and testicular hypoplasia), differential diagnosis of scrotal enlargement, differential diagnosis of causes of progressive testicular enlargement, and differential diagnosis of testicular asymmetry or reduction in size with an emphasis on testicular degeneration. The sudden increase in testicular size is often accompanied by severe clinical signs and is a major cause for referral of stallion for surgery. Testicular disorders are illustrated with clinical cases seen by the authors.

Paraneoplastic neurologic syndrome and autoantibody accompaniments of germ cell tumors

Paraneoplastic neurologic syndromes (PNSs) are a group of diseases affecting the central and/or peripheral nervous system caused by immune-mediated processes directed toward antigens with shared expression in tumor and neural tissue. Germ cell tumors (GCTs) are associated with PNSs with varied clinical phenotypes. Early diagnosis of PNS is vital to potentially uncover and treat underlying tumors, improving the chances of recovery, and preventing permanent neurologic complications. In this chapter, we outline the pathophysiology and epidemiology of PNS. We briefly provide a summary of GCTs in males and females. We review the neural-specific autoantibodies and PNSs associated with GCTs and their clinical and radiologic accompaniments. We also provide an overview of the treatment and prognosis of these disorders.

A Rare Case of Post-orchidectomy Arterial Injury With Rapidly Enlarging Scrotal Hematoma Treated With Coil Embolization

Testicular cancer is the most common solid tumor in young adult males. Radical inguinal orchidectomy is the gold standard for the diagnosis and treatment of testicular cancer, which is confined to the scrotum and is generally well tolerated. An uncommon, but known, complication of radical orchidectomy is scrotal hematoma. Scrotal hematoma from radical orchidectomy is commonly self-limited and typically self-resolving. We present a rare case of metastatic testicular malignancy diagnosed with radical inguinal orchidectomy complicated by a rapidly enlarging scrotal hematoma, successfully treated with surgical evacuation and image-guided arterial embolization.

Imaging in Male Infertility

Infertility is defined as inability to conceive despite regular unprotected sexual intercourse for greater than 1 year. Conditions involving the male partner accounts for the infertility in approximately 50% of cases. The goals of imaging in male infertility are to detect treatable/ reversible causes, imaging for sperm retrieval from testis or epididymis for assisted reproductive techniques like in vitro fertilization or intracytoplasmic sperm injection and to provide appropriate genetic counselling for prevention of occurrence of disease in future offspring. The purpose of this article is to describe imaging features in various causes of male infertility to acquaint radiologists with various imaging appearances of causes of male infertility to avoid missing these pathologies.

Indications and histology of 489 orchiectomies analyzed by patient age

OBJECTIVE

To evaluate the indications and histology of our series of orchiectomies, analysing the results by patient's age.

METHODS

We included the orchiectomies realized in our hospital between 2005 and 2020 in patients older than 18 years. We estimated demographic data, indications, histology and effectiveness of testicular ultrasound by three groups of age.

RESULTS

We included 489 orchiectomies, which 364 (74%) belonged to Group A (patients between 18-50 years), 59 (12%) to Group B (50-70 years) and 66 (14%) to Group C (older than 70 years). In Group A, 284 (78%) orchiectomies were indicated due to malignancy suspect. In 91.9% cases (261) malign neoplasm was confirmed at final histology and 253 (89%) were germinal cells. Testicular ultrasound had a positive predictive value (PPV) of 90% in this group. In Group B, 34 (57%) orchiectomies were indicated because of malignancy suspect. At final histologic analysis, 25/34 (73.5%) confirmed malign neoplasm. Ultrasound had a PPV of 68%. In Group C, orchiepididymitis was the main cause of testicular removal with 30 cases (45,5%). From the 20 cases (30.3%) with suspicion of malignancy, only 6 had confirmed malign histology. Testicular ultrasound PPV for malignancy was 31%.

CONCLUSION

In patients younger than 70 years the main orchiectomy's indication was suspect of malignancy and in older than 70, testicular inflammation. The germinal neoplasm was the predominant histology in younger than 70 years. In older than that, malignancy was infrequent. The positive predictive value of testicular ultrasound for malignancy decreased with patient's age. In patients older than 50 years proper image diagnosis to assess malignancy should be considered before orchiectomy is done.

Diagnostic yield and safety of ultrasound-guided percutaneous testicular biopsies in children

BACKGROUND

Traditionally, testicular biopsy is performed using an open surgical approach. Ultrasound-guided percutaneous biopsy is a less invasive alternative and can be performed in children.

OBJECTIVE

The aim of this study is to report our technique and to assess the diagnostic accuracy and safety of ultrasound-guided percutaneous biopsy of testicular masses in children.

MATERIALS AND METHODS

This is a 16-year retrospective review of ultrasound-guided percutaneous testicular biopsies at a single pediatric hospital.

RESULTS

We performed nine ultrasound-guided testicular biopsies in 9 patients (median age: 3 years, range: 4 months-11 years; median weight: 20.9 kg, range: 8.4-35 kg; median volume of testicular lesion biopsied: 4.4 mL, range: 1.2-17 mL). A percutaneous co-axial technique was used for 5/9 biopsies with absorbable gelatin sponge tract embolization performed in 4 of those biopsies. A non-co-axial technique was used in 4/9 biopsies. A median of three cores, range 2-6, were obtained. The diagnostic yield was 89% with one biopsy yielding material suggestive of, but insufficient for, a definitive diagnosis. The most common histological diagnosis was leukemic infiltration, occurring in 6/9 biopsies. Of the remaining three biopsies, one biopsy was suggestive of, but not confirmatory for, juvenile granulosa cell tumor and two biopsies confirmed normal testicular tissue; the long-term follow-up of which demonstrated normal growth and no lasting damage. There was one (clinically insignificant) complication out of nine biopsies (11%, 95% confidence interval 0-44%): a mild, self-resolving scrotal hematoma.

CONCLUSION

Ultrasound-guided testicular biopsy can be performed safely in children as an alternative to open surgical biopsy, with a high diagnostic yield and low complication rate.

How [18F]-FDG-PET/CT Affects Clinical Management of Patients with Germ Cell Tumors in the Real World

OBJECTIVE

The aim of this study was to evaluate the impact of PET/CT on clinical management of patients with germ cell tumors (GCTs) conducted in a real-world setting, including avoidance of invasive procedures, additional diagnostic imaging, and changes in treatment.

METHODS

Patients with GCTs were prospectively enrolled into a PET/CT registry study between May 2013 and April 2021. Intended patient management prior and after PET/CT was documented using standardized questionnaires. Changes in oncologic staging and clinical management after PET/CT were recorded, including planned treatment and planned additional diagnostics.

RESULTS

Forty-three male patients with GCTs were included consecutively in this study. After PET/CT, oncologic staging changed in 22/43 patients (51%), with upstaging in seven cases (16%), downstaging in ten cases (23%), and cancer relapse in five cases (11%). The number of patients with intended curative treatment remained stable, while a considerable change in intended therapeutic intervention was noted after PET/CT, with an increase in planned chemotherapy from three to eleven patients and a decrease in planned surgical resection from eleven to two patients. In addition, PET/CT contributed to preventing patients from intended invasive procedures including biopsy and surgery in 8/43 (19%) cases and from additional diagnostic procedures in 25 (58%) cases.

CONCLUSION

With the use of FDG-PET/CT as a tool to guide patient management in GCTs, we observed a notable impact on clinical staging and a consequent reduction in the need for additional invasive and diagnostic procedures. These findings are expected to be even more consequential in the future as treatment modalities improve and the life expectancy of GCT patients further increases.

KEY POINTS

PET/CT considerably influences the clinical stage of GCT patients. PET/CT has remarkable influence on the choice of therapeutic interventions and reduces additional diagnostic procedures.

Absolute monocyte count has a diagnostic role in distinguishing tumor marker-negative TGCT from benign testicular tumor via CCL2 regulation

Clinically, for testicular tumor patients with negative tumor markers, how to distinguish the malignant from the benign is a difficult problem. This study aimed to assess the clinical significance of the absolute monocyte count (AMC) in differential diagnosis of testicular germ cell tumor with stage S0 (TGCTS0) and benign testicular tumor. In this retrospective single-center study, a total of 90 patients newly diagnosed with benign testicular tumor or TGCTS0 were reviewed. All patients received surgical intervention as the primary treatment method. AMC and other clinicopathological parameters were analyzed. Receiver operating characteristic (ROC) curves were constructed to assess the diagnostic power of investigated parameters, and to determine the optimal cutoff values. Kaplan-Meier curve analysis was used to study the survival of patients with TGCTS0. qRT-PCR and immunohistochemistry (IHC) were performed to examine the expression of C-C motif chemokine ligand 2 (CCL2) mRNA and protein respectively. Differential gene expression and functional enrichment analysis were performed using Gene Expression Omnibus and the Cancer Genome Atlas databases. The mean preoperative AMC in patients with TGCTS0 was significantly higher than that in patients with benign testicular tumor (P = .020). AMC > 0.485*10^9/L was identified to be associated with the presence of TGCTS0 (hazard ratio [HR] = 3.074, P = .026), and patients with higher AMC level had worse progression free survival (PFS) (P = .047). Furthermore, AMC combined with lactate dehydrogenase (LDH) achieved a better diagnostic efficacy for TGCTS0 (area under curve [AUC] = 0.695). Tumor-associated macrophages (TAMs) signature gene CCL2 was highly expressed in TGCT compared with normal testicular tissue. Functional enrichment analysis showed that CCL2 is closely involved in the Extracellular Matrix Organization pathway and positively correlated with the expression of various matrix metalloproteinases (MMPs). Elevated AMC may serve as a predictor of higher risk of TGCTS0, and CCL2 mediated TAMs infiltration and MMPs secretion is essential for the tumorigenesis of TGCT.

Imaging of pediatric testicular tumors: A COG Diagnostic Imaging Committee/SPR Oncology Committee White Paper

Primary intratesticular tumors are uncommon in children, but incidence and risk of malignancy both sharply increase during adolescence. Ultrasound is the mainstay for imaging the primary lesion, and cross-sectional modalities are often required for evaluation of regional or distant disease. However, variations to this approach are dictated by additional clinical and imaging nuances. This paper offers consensus recommendations for imaging of pediatric patients with a known or suspected primary testicular malignancy at diagnosis and during follow-up.

Bilateral synchronous testicular cancer: A case report

INTRODUCTION AND IMPORTANCE

Testicular cancer is the most common type of malignancy in young adult males, accounting for 1 % of all cancer diagnosis in men and 5 % of all urologic tumors. It is one of the malignancies with the highest cure rate. Bilateral germ cell tumor of the testicles is rare, representing only 1 % of all new cases of testicular cancer, around 30 % of which occur synchronously. Interestingly, there is not yet an occurrence where the bilateral synchronous testicular cancer has different histopathological type.

CASE PRESENTATION

In this paper, we performed bilateral radical orchiectomy in different occasion, followed by adjuvant chemotherapy (BEP regiment).

CLINICAL DISCUSSION

Since the clinical result is excellent, this finding could be a breakthrough in testicular cancer study. A cellular communication between different cancer cell type through chemokine which could affect response to chemotherapy.

CONCLUSION

Treatment with surgery and chemotherapy is well tolerated and received. A further specific clinical study needs to be performed to investigate this finding in the future.

Diagnostic and Imaging Features of a Non-seminomatous Germ Cell Tumor of the Testis: A Case Report and Review of the Literature

Neoplasms involving the testes are uncommon. They account for up to 10% of all malignant diseases affecting the male genitourinary system and for around 2% of all malignant neoplasms in males. Testicular tumors are the third highest cause of mortality in males between the age of 20 and 40 years. We present a case of a young patient with right-sided scrotal swelling associated with pain. Ultrasonography, elastography, computed tomography, and magnetic resonance imaging features revealed non-seminomatous germ cell tumors of the testis. The patient underwent inguinal orchidectomy for the same and was sent for histopathological evaluation. The imaging diagnosis was consistent with the histopathological diagnosis. This case report adds to the knowledge of imaging features of testicular tumors and their identification based on imaging.

Testicular Cancer: Contemporary Updates in Staging

Testicular tumors are the most common solid tumors in young men, the vast majority of which are of germ cell origin. The staging of human cancers is paramount to correct patient management. Staging systems have passed through several developments leading to the release of the most recent 8th edition of the American Joint Committee for Cancer (AJCC) staging manual, which is based on the current understanding of tumor behavior and spread. In this review, the authors summarize the current AJCC staging of the germ cell tumors, highlight essential concepts, and provide insight into the most important parameters of testicular tumors.

Testis and epididymis–unusual sites of metastatic gastric cancer: A case report and review of the literature

BACKGROUND

Although gastric cancer is one of the most prevalent cancers worldwide, cases of gastric cancer metastasis to the male reproductive system are rare. Here, we report a case involving testicular and epididymal gastric cancer metastases.

CASE SUMMARY

A 75-year-old Chinese man complained of experiencing a palpable painful mass in the right scrotum for 6 mo. He had undergone distal gastrectomy with chemotherapy for pT3N3aMx poorly differentiated gastric adenocarcinoma 9 mo before. Physical examination revealed a moderate right hydrocele and a painful mass in the right testis and epididymis. Serum tumor biomarkers were all normal except for elevated beta-human chorionic gonadotropin levels. Computed tomography urography and B-ultrasound imaging revealed a moderate right hydrocele and a mixed solid-cystic mass in the right testicular and epididymal area. Thus, the patient underwent right radical orchiectomy. Immunohistochemical analysis revealed that the tumor cells were positive for pancytokeratins and caudal related homeodomain transcription 2. Metastatic, poorly differentiated gastric adenocarcinoma of the testis and epididymis was confirmed by pathology. He continued to undergo chemotherapy at the department of oncology of our hospital. Mesenteric lymph node metastases were found at the postoperative 1-mo follow-up.

CONCLUSION

Palpable, painful scrotal mass, history of gastric cancer, and imaging features may indicate testicular and epididymal metastatic gastric cancer.

Lost in descent: Complications of cryptorchidism

Cryptorchidism is a relatively common and important clinical entity and can lead to an array of downstream complications if it is not corrected in a timely manner, most notably with the development of testicular germ cell tumors. However, beyond the development of malignancy, there are other rare complications associated with cryptorchid testicular germ cell tumors which are more commonly seen in females with ovarian germ cell tumors, including torsion, rupture, and paraneoplastic syndromes. Presented is an instructive case (with literature review) of a patient who presented with NMDA encephalitis due to a torsed mixed germ cell tumor of an undescended testis, which subsequently ruptured leading to growing teratoma syndrome.

An Overview of the Role of Multiparametric MRI in the Investigation of Testicular Tumors

Simple Summary

Although conventional ultrasonography remains the primary imaging modality for the assessment of testicular tumors, multiparametric MRI of the scrotum, which combines morphologic and functional data, serves as a powerful adjunct. Based on the recommendations issued by the Scrotal and Penile Imaging Working Group of the European Society of Urogenital Radiology, scrotal MRI is strongly recommended after equivocal US findings. In cases of testicular masses, the main clinical indications are as follows: lesion characterization when sonographic findings are non-diagnostic, discrimination between germ-cell and non-germ-cell testicular tumors, local staging of testicular tumors in patients who are candidates for testis-sparing surgery, and preoperative histological characterization of testicular germ-cell tumors in selected cases. This article aims to provide an overview of the role of multiparametric MRI in the investigation of testicular tumors.

Abstract

Conventional ultrasonography represents the mainstay of testis imaging. In cases in which ultrasonography is inconclusive, scrotal MRI using a multiparametric protocol may be used as a useful problem-solving tool. MRI of the scrotum is primarily recommended for differentiating between benign and malignant testicular masses when sonographic findings are ambiguous. This technique is also accurate in the preoperative local staging of testicular tumors and, therefore, is recommended in patients scheduled for testis-sparing surgery. In addition, MRI may provide valuable information regarding the histological characterization of testicular germ-cell tumors, in selected cases. Scrotal MRI may also help in the differentiation between testicular germ-cell neoplasms and non-germ-cell neoplasms. Axial T1-weighted imaging, axial and coronal T2-weighted imaging, axial diffusion-weighted imaging, and coronal subtracted dynamic contrast-enhanced imaging are the minimum requirements for scrotal MRI. A variety of MRI techniques—including diffusion tensor imaging, magnetization transfer imaging, proton MR spectroscopy, volumetric apparent diffusion coefficient histogram analysis, and MRI-based radiomics—are being investigated for testicular mass characterization, providing valuable supplementary diagnostic information. In the present review, we aim to discuss clinical indications for scrotal MRI in cases of testicular tumors, along with MRI findings of common testicular malignancies.

Testicular Germ Cell Tumours—The Role of Conventional Ultrasound

Testicular tumours are the most common tumours found in young males and germ cell tumours account for 95% of testicular tumours. Ultrasound is the first-line radiological investigation for imaging of the testis. This article outlines how to undertake an ultrasound examination, including optimal patient position, scanning technique and imaging parameters. Classification of germ cell tumours is provided, and salient imaging features of different tumours are described. Difficulties and pitfalls of ultrasound are described, including tumours found after a trauma presentation, orchitis causing diagnostic difficulties and imaging of small testicular lesions. Other uses of ultrasound are outlined, including looking for a primary testicular tumour following the discovery of retroperitoneal lymph nodes, imaging when tumour-makers increase, local recurrence in the scrotum, and for solid organ biopsy in metastatic disease. Conclusion: Ultrasound remains the first-line of investigation for imaging of the testis, and conventional ultrasound still plays a large role in imaging. On ultrasound alone, accurate morphological characterisation of tumours remains a challenge, despite the imaging features that can be seen in different tumour types. Therefore, histology following orchidectomy of a germ cell tumour remains the gold standard for accurate tumour characterisation.

Complications of lymphoma in the abdomen and pelvis: clinical and imaging review

Involvement of the abdomen and pelvis is common in lymphoma. Nodal and extranodal abdominal and pelvic lymphoma may present with various complications. Complications are most common in high-grade lymphomas, especially diffuse large B-cell lymphoma. Complications may occur as the initial manifestation of lymphoma, during treatment course, or late following complete disease remission. Most complications are associated with worse prognosis and increased mortality. Imaging is essential in evaluation of disease extent and diagnosis of complications. Therefore, radiologists should be familiar with the clinical context and imaging features of abdominal and pelvic lymphoma complications. We provide a comprehensive, organ system-based approach, and clinical and imaging review of complications of abdominal and pelvic lymphoma along with radiologic images of illustrated cases of the most commonly encountered complications.

Imaging of Pediatric Testicular and Para-Testicular Tumors: A Pictural Review

Pre- and post-pubertal testicular tumors are two distinct entities in terms of epidemiology, diagnosis and treatment. Most pre-pubertal tumors are benign; the most frequent are teratomas, and the most common malignant tumors are yolk-sac tumors. Post-pubertal tumors are similar to those found in adults and are more likely to be malignant. Imaging plays a pivotal role in the diagnosis, staging and follow-up. The appearance on ultrasonography (US) is especially helpful to differentiate benign lesions that could be candidates for testis-sparing surgery from malignant ones that require radical orchidectomy. Some specific imaging patterns are described for benign lesions: epidermoid cysts, mature cystic teratomas and Leydig-cell tumors. Benign tumors tend to be well-circumscribed, with decreased Doppler flow on US, but malignancy should be suspected when US shows an inhomogeneous, not-well-described lesion with internal blood flow. Imaging features should always be interpreted in combination with clinical and biological data including serum levels of tumor markers and even intra-operative frozen sections in case of conservative surgery to raise any concerns of malignity. This review provides an overview of imaging features of the most frequent testicular and para-testicular tumor types in children and the value of imaging in disease staging and monitoring children with testicular tumors or risk factors for testicular tumors.

Ectopic lesions in the abdomen and pelvis: a multimodality pictorial review

Various ectopic lesions occur in the abdomen and pelvis and affect multiple organs including liver, gallbladder, pancreas, spleen, and organs of the genitourinary system. Ectopic organs may be present outside their normal positions, or ectopic tissues may develop while the original organ exists in its normal position. Both benign and malignant lesions can occur in ectopic organs and tissues. Owing to their unusual location, they can often be misdiagnosed as other lesions or even malignant lesions, such as metastasis or seeding. This multimodality pictorial review provides various cases of ectopic lesions in the abdomen and pelvis, which will help narrow the differential diagnosis and guide clinical decision-making.

ACR Appropriateness Criteria® Staging and Surveillance of Testicular Cancer: 2021 Update

The staging and surveillance of testicular cancer is a complex topic, which integrates clinical, biochemical, and imaging components. The use of imaging for staging and surveillance of testicular cancer is individually tailored to each patient by considering tumor histology and prognosis. This document discusses the rationale for use of imaging by imaging modality during the initial staging of testicular seminoma and nonseminoma tumors and during the planned surveillance of stage IA and IB testicular cancer by histological subtype integrating clinical suspicion for disease recurrence in surveillance protocols. The American College of Radiology Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed annually by a multidisciplinary expert panel. The guideline development and revision include an extensive analysis of current medical literature from peer reviewed journals and the application of well-established methodologies (RAND/UCLA Appropriateness Method and Grading of Recommendations Assessment, Development, and Evaluation or GRADE) to rate the appropriateness of imaging and treatment procedures for specific clinical scenarios. In those instances where evidence is lacking or equivocal, expert opinion may supplement the available evidence to recommend imaging or treatment.

Diffusion-Weighted MRI in the Genitourinary System

Diffusion weighted imaging (DWI) constitutes a major functional parameter performed in Magnetic Resonance Imaging (MRI). The DW sequence is performed by acquiring a set of native images described by their b-values, each b-value representing the strength of the diffusion MR gradients specific to that sequence. By fitting the data with models describing the motion of water in tissue, an apparent diffusion coefficient (ADC) map is built and allows the assessment of water mobility inside the tissue. The high cellularity of tumors restricts the water diffusion and decreases the value of ADC within tumors, which makes them appear hypointense on ADC maps. The role of this sequence now largely exceeds its first clinical apparitions in neuroimaging, whereby the method helped diagnose the early phases of cerebral ischemic stroke. The applications extend to whole-body imaging for both neoplastic and non-neoplastic diseases. This review emphasizes the integration of DWI in the genitourinary system imaging by outlining the sequence's usage in female pelvis, prostate, bladder, penis, testis and kidney MRI. In gynecologic imaging, DWI is an essential sequence for the characterization of cervix tumors and endometrial carcinomas, as well as to differentiate between leiomyosarcoma and benign leiomyoma of the uterus. In ovarian epithelial neoplasms, DWI provides key information for the characterization of solid components in heterogeneous complex ovarian masses. In prostate imaging, DWI became an essential part of multi-parametric Magnetic Resonance Imaging (mpMRI) to detect prostate cancer. The Prostate Imaging-Reporting and Data System (PI-RADS) scoring the probability of significant prostate tumors has significantly contributed to this success. Its contribution has established mpMRI as a mandatory examination for the planning of prostate biopsies and radical prostatectomy. Following a similar approach, DWI was included in multiparametric protocols for the bladder and the testis. In renal imaging, DWI is not able to robustly differentiate between malignant and benign renal tumors but may be helpful to characterize tumor subtypes, including clear-cell and non-clear-cell renal carcinomas or low-fat angiomyolipomas. One of the most promising developments of renal DWI is the estimation of renal fibrosis in chronic kidney disease (CKD) patients. In conclusion, DWI constitutes a major advancement in genitourinary imaging with a central role in decision algorithms in the female pelvis and prostate cancer, now allowing promising applications in renal imaging or in the bladder and testicular mpMRI.

The Mutation of BTG2 Gene Predicts a Poor Outcome in Primary Testicular Diffuse Large B-Cell Lymphoma

Introduction

Methods

Results

Conclusion

NPS-1034 Induce Cell Death with Suppression of TNFR1/NF-κB Signaling in Testicular Cancer

Background and objectives: NPS-1034 with a dual inhibitory effect on Met and Axl kinase receptors has exhibited therapeutic potential in previous models. However, no study on treating testicular cancer (TC) cell lines with NPS-1034 has been established. Materials and Methods: In this study, a series of in vitro examinations of the apoptotic effect induced by NPS-1034 in TC cell lines was conducted to clarify the molecular interactions involved. Results: A decrease in cell viability rate was observed following NPS-1034 treatment, as shown in the MTT assay. Induction of the apoptotic effect was observed in TC cells as the sub-G1 and Annexin-PI populations increased in a dose-dependent manner. The involvement of the tumor receptor necrosis factor receptor 1 (TNFR1) pathway was later determined by the proteome array and western blotting. A reduction in TNFR1 and NF-κB downstream protein expressions, an upregulation of cleaved caspase-3 and -7, and a downregulation of survivin and claspin all reassured the underlying mechanism of the TNFR1 involved in the apoptotic pathway induced by NPS-1034. Conclusions: Our findings provide evidence for a potential underlying TNFR1 pathway involved in NPS-1034 treatment. This study should offer new insights into targeted therapy for TC.

[Magnetic resonance imaging accuracy and utility for testicular cancer diagnosis]

PURPOSE

The purpose of our study is to analyze the imaging findings described in MRI and the histopathologic type of testicular lesions to determine which findings are the best predictors of malignancy.

MATERIALS AND METHODS

Forty six (46) patients with testicular lesions were initially studied with ultrasound (US) and with testicular MRI (tMRI) on a 1.5-T magnet. MRIs were reviewed by a radiologist with 8 years of experience and imaging findings such as the size of the lesion, the signal intensity in T1, T2 weighted sequences, and the enhancement after endovenous contrast administration, were correlated with the histopathologic diagnosis. Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were analyzed.

RESULTS

The enhancement after administration of contrast was the finding of better performance with a sensitivity, specificity, PPV and NPV of 90 (71-97), 47 (24-71), 74 (56-87) and 73 (40-92), respectively. Meanwhile, the results for hypointense/heterogeneous lesions in T2 weighted sequences and with enhancement with intravenous contrast were 87 (49-84), 47 (44-89), 74 (55-86) y 67 (35-89), respectively.

CONCLUSION

The finding of a testicular lesion of low signal intensity and heterogeneous in T2 weighted sequences, with IV contrast enhancement represents a valuable predictor of malignancy. The latter being the most sensitive as a predictor of malignancy.

Characterization of Testicular Tumor Lesions in Dogs by Different Ultrasound Techniques

In this retrospective study, we assessed the accuracy of different blood flow imaging in diagnosing testicular tumor types in dogs. We recruited 27 dogs with leydigomas (14), seminomas (eight), sertoliomas (six), and mixed cells (five) confirmed histopathologically. In intact dogs, Pampiniform plexus and marginal arteries were scanned through pulsed Doppler. Blood flow and presence of intralesional/perilesional arteries were assessed by color and power Doppler, B-flow, and contrast-enhanced ultrasound. Tumor types did not differ by B-Mode ultrasonography characters. Pampiniform and testicular arteries of sertoliomas had higher (p < 0.05) pulsatility and resistive indexes. The proportion of leydigomas with a perilesional and/or perilesional/intralesional blood flow pattern detected by color and pulsed Doppler and B-flow was higher (p < 0.05) than that of the other tumors counted together. This resulted in a sensitivity of 81.8%, 83.3%, and 85.7%, a specificity of 76.5%, 56.3%, and 73.7%, and a correct classification rate of 78.6%, 67.9%, and 78.8%, respectively. While contrast enhanced ultrasound was highly effective in detecting all tumors, qualitative and quantitative parameters did not contribute to their differential diagnosis. In conclusion, results indicate that different testicular tumor types of dogs have subtly different vascular patterns, a condition that could help in identifying leydigomas.

Ultrasonography of the scrotum: Revisiting a classic technique

Conventional US is the primary imaging modality for the evaluation of the scrotum, due to its high resolution, availability, cost-effectiveness and absence of ionizing radiation. Grayscale and color Doppler US provide a comprehensive assessment of scrotal diseases. The technique represents the mainstay for imaging of acute scrotum. US is highly accurate in the detection, localization and characterization of scrotal masses. Multiparametric US, including conventional US, contrast-enhanced US and tissue elastography has improved the diagnostic performance of the technique in the assessment of testicular diseases. MRI represents a valuable supplemental imaging tool for the investigation of scrotal pathology, mainly recommended in cases of indeterminate US findings. Recommendations recently issued by the European Society of Urogenital Radiology Scrotal and Penile Imaging Working Group (ESUR-SPIWG) refer to the use of scrotal sonography for the evaluation of pathologic entities, including testicular microlithiasis, small, non-palpable incidentally detected testicular masses, varicocele and scrotal trauma. In this review, the technical specifications for scrotal US and the normal sonographic findings are presented. Grayscale and color Doppler US findings of common acute scrotal diseases and scrotal masses are discussed. The complimentary role of multiparametric US and scrotal MRI is addressed. ESUR-SPIWG's guidelines are also reviewed.

Testicular Germ Cell Tumors: Classification, Pathologic Features, Imaging Findings, and Management

Testicular germ cell tumors (TGCTs) demonstrate a wide variety of histopathologic, genetic, pathogenetic, and immunocytochemical characteristics and various clinical-biologic profiles and prognoses. Most TGCTs arise from an intratubular precursor cell referred to as germ cell neoplasia in situ (GCNIS), which is an embryonic germ cell with the potential to differentiate into a plethora of embryonic and extraembryonic lineages. Advances in pathologic examination and genetics paved the way for the 2016 World Health Organization (WHO) classification system, which recognizes two pathogenetically distinct groups of TGCTs. Although postpubertal tumors originate from GCNIS, almost all prepubertal tumors belong to the non-GCNIS category. Molecular testing for chromosome 12p amplification helps to distinguish the two tumor categories. Imaging techniques such as US, CT, MRI, and fluorine 18 (¹⁸F)-fluorodeoxyglucose PET/CT are pivotal to the diagnosis and staging, evaluation of complications and treatment response, and long-term surveillance of TGCTs. In addition, select MRI findings may help to differentiate a seminoma from a nonseminomatous mixed TGCT. Accurate diagnosis of TGCTs has therapeutic and prognostic implications. Although seminomas show exquisite response to chemotherapy and radiation therapy, postpubertal teratomas are highly resistant to both. The 2016 WHO classification system introduced changes in the diagnosis and management of TGCTs, including the development of new treatment and follow-up guidelines. Radiologists play an essential role in the optimal treatment of patients with TGCTs. Online supplemental material is available for this article. ©RSNA, 2021.

The Rare, the Odd, and the Atypical: A Pictorial Essay of Testicular and Paratesticular Diseases

ABSTRACT

Understanding a variety of scrotal diseases is essential to developing an accurate differential diagnosis and is critical in providing optimal patient care. Ultrasound is the imaging modality of choice when evaluating for scrotal pathology, with the major purpose of locating such pathology to either the testis, or epididymis, or other intrascrotal structures, as well as characterizing lesions as solid or cystic. It is generally assumed that most solid intratesticular masses are more likely malignant, whereas most extratesticular ones are benign, although some exceptions to that rule exist. This pictorial essay will focus on rare and less commonly encountered benign and malignant testicular and paratesticular pathologies, which may pose a diagnostic dilemma for interpreting radiologists and treating physicians. Knowledge of their imaging characteristics will help narrow the differential diagnosis and assist in proper patient management and care.

Testicular cancer with extensive gonadal and renal vein tumor thrombus

Tumor thrombus has been demonstrated to occur with hepatocellular and renal cell carcinoma, however, rarely occurs in testicular germ cell malignancies. Tumor thrombus results from the intravascular invasion of malignant cells, different from the hypercoagulable state induced by malignancy, and has significant implications with regards to prognosis and therapeutic options. We describe a case of an otherwise healthy 30-year-old patient with extensive gonadal and renal vein tumor thrombus from testicular germ cell cancer, as well as discuss the diagnosis and treatment options for this type of metastatic disease.

Identifying the deceiver: the non-neoplastic mimickers of genital system neoplasms

Tumors of the genital system are common and imaging is of crucial importance for their detection and diagnosis. Several non-neoplastic diseases may mimic these tumors and differential diagnosis may be difficult in certain cases. Misdiagnosing non-neoplastic diseases as tumor may prompt unnecessary medical treatment or surgical interventions. In this article, we aimed to present the imaging characteristics of non-neoplastic diseases of the male and female genital systems that may mimic neoplastic processes. Increasing awareness of the imaging specialists to these entities may have a severe positive impact on the management of these patients.

When to ask for an MRI of the scrotum

Background

Multiparametric MRI (mpMRI) of the scrotum has been established as a useful second‐line diagnostic tool for the investigation of scrotal diseases. Recently, recommendations on clinical indications for scrotal MRI were issued by the Scrotal and Penile Imaging Working Group of the European Society of Urogenital Radiology.

Objective

To update current research on when to ask for an MRI of the scrotum.

Methods

PubMed database was searched for original articles and reviews published during 2010–2021.

Results

Eighty‐three articles fulfilled the search criteria. Scrotal MRI is mainly recommended after inconclusive US findings or inconsistent with the clinical examination and should be asked in the following cases: differentiation between intratesticular and paratesticular lesions (in rare cases of uncertain US findings), characterization of paratesticular and intratesticular lesions (when US findings are indeterminate), discrimination between germ cell and sex cord‐stromal testicular tumors, local staging of testicular malignancies (in patients planned for testis‐sparing surgery), differentiation between seminomas and non‐seminomatous tumors (when immediate chemotherapy is planned and orchiectomy is delayed), assessment of acute scrotum and scrotal trauma (rarely needed, in cases of non‐diagnostic US findings) and detection and localization of undescended testes (in cases of inconlusive US findings). Although preliminary data show promising results in the evaluation of male infertility, no established role for mpMRI still exists.

Conclusion

Multiparametric MRI of the scrotum, by assessing morphologic and functional data represents a valuable problem‐solving tool, helping to improve our understanding on the nature of scrotal pathology and the process of spermatogenesis. The technique may improve patient care and reduce the number of unnecessary surgical procedures.

Ultrasound morphological patterns of testicular tumours, correlation with histopathology

INTRODUCTION

Ultrasound (US) plays a key role in the detection of testicular tumours. However, reliable characterisation of testicular tumours with US is difficult. The purpose of this study was to investigate the morphological patterns of testicular tumours as seen on modern US imaging and correlate these with histology.

METHODS

The imaging features of 50 testicular tumours were analysed and compared with histology. The US appearance was categorized into 15 distinct morphological patterns.

RESULTS

Patient's age ranged from 0.5 to 85 years. Of the 50 tumours in our series, 49 were malignant. Nearly half of the malignancies were seminomatous germ cell tumours (SGCTs). Tumours ranged in size from 10 to 130 mm with considerable overlap of size between tumours of different histological type. Even small (10 mm) tumours in our cohort were malignant. SGCTs demonstrated a narrower range of morphological appearances than non-seminomatous germ cell tumours (NSGCTs). Calcification was common in both SGCT and NSGCTs. Multicomponent cystic-solid appearance was only seen in NSGCTs.

CONCLUSION

The differentiation of testicular tumours with US continues to be challenging. In this paper, we have demonstrated the diverse morphological patterns of testicular neoplasms and have proposed the study of tumour morphological features as a promising research direction.

The potential role of MR based radiomic biomarkers in the characterization of focal testicular lesions

How to differentiate with MRI-based techniques testicular germ (TGCTs) and testicular non-germ cell tumors (TNGCTs) is still under debate and Radiomics may be the turning key. Our purpose is to investigate the performance of MRI-based Radiomics signatures for the preoperative prediction of testicular neoplasm histology. The aim is twofold: (i), differentiating TGCTs and TNGCTs status and (ii) differentiating seminomas (SGCTs) from non-seminomatous (NSGCTs). Forty-two patients with pathology-proven testicular neoplasms and referred for pre-treatment MRI, were retrospectively enrolled. Thirty-two out of 44 lesions were TGCTs. Twelve out of 44 were TNGCTs or other histologies. Two radiologists segmented the volume of interest on T2-weighted images. Approximately 500 imaging features were extracted. Least Absolute Shrinkage and Selection Operator (LASSO) was applied as method for variable selection. A linear model and a linear support vector machine (SVM) were trained with selected features to assess discrimination scores for the two endpoints. LASSO identified 3 features that were employed to build fivefold validated linear discriminant and linear SVM classifiers for the TGCT-TNGCT endpoint giving an overall accuracy of 89%. Four features were employed to build another SVM for the SGCT-SNGCT endpoint with an overall accuracy of 86%. The data obtained proved that T2-weighted-based Radiomics is a promising tool in the diagnostic workup of testicular neoplasms by discriminating germ cell from non-gem cell tumors, and seminomas from non-seminomas.

Pure testicular choriocarcinoma Cannonball metastases as a presenting imaging feature: A case report and a review of literature

Pure testicular choriocarcinoma is an extremely rare subtype of nonseminomatous germ cell tumor, accounting for less than 1% of all germ cell tumors and only 0.19% of all testicular tumors. It is a highly aggressive malignant tumor with early multiorgan metastasis and poor prognosis. We present a case of 23-year-old male presented to the hospital with mild hemoptysis which was thought as a sequela of his past COVID-19 pneumonia infection, however; chest radiograph showed multiple rounded cannonball opacities seen throughout both lungs raising the suspicion of metastatic deposits to the lungs. During physical examination, left testicular painless swelling was noted leading to an ultrasound of the scrotum which revealed a left intratesticular infiltrative, heterogeneous mass. Tumor markers, including beta-human chorionic gonadotropin, lactate dehydrogenase and alpha fetoprotein were extremely high. Computed tomography scan of the brain, chest, abdomen, and pelvis showed hemorrhagic metastatic deposits to the brain, chest, and left para-aortic lymph nodes. The patient underwent radical orchiectomy and histopathology reports confirmed the diagnosis of pure testicular choriocarcinoma.

Diagnostic performance of multi-parametric MRI to differentiate benign sex cord stromal tumors from malignant (non-stromal and stromal) testicular neoplasms

PURPOSE

Testicular stromal tumors are uncommon, although mostly benign. The purpose of this study is to assess the role of multi-parametric MRI in differentiating benign testicular stromal tumors from malignant testicular neoplasms (non-stromal and stromal).

METHODS

A single-center retrospective study comparing benign stromal tumors (STs) to malignant testicular neoplasms (MTNs) was conducted. MR imaging assessment included tumor size, T2- and T1-weighted signal intensity, T2- and T1-weighted texture pattern, diffusion restriction, presence of hemorrhage and/or necrosis, and measurement of apparent diffusion coefficient and dynamic contrast enhancement (DCE). Inter-observer agreement was assessed using Cohen's kappa and Bland-Altman and data were compared using independent t-tests or χ². Receiver operating characteristic curve analysis was used to test models incorporating various imaging features.

RESULTS

Radical orchiectomy and histopathology revealed 20 testicular neoplasms: seven STs (35%) and thirteen MTNs (65%). MTNs were significantly larger in size than STs (5.1 ± 2.36 cm vs. 1.27 ± 0.56 cm; p-value < 0.001). STs demonstrated more hypointense T2W signal (85.7% vs. 46.2%; p-value < 0.09), less T2W heterogeneous texture (14.3% vs. 61.5%; p-value < 0.04), and less diffusion restriction (16.7% vs. 83.3%; p-value < 0.01) in comparison to MTNs. STs demonstrated mainly homogenous post-contrast enhancement pattern (71.4% vs. 7.7%; p-value < 0.004), while MTNs showed primarily heterogeneous enhancement pattern (77% vs. 14.3%; p-value < 0.02). STs revealed greater corrected venous phase enhancement (STs: 0.59 ± 0.29; MTNs: 0.25 ± 0.25; p-value < 0.03). STs showed higher ADC values, though the difference was not statistically significant (p-value < 0.25). A model combining T2W, DWI, and DCE features showed the best overall diagnostic accuracy with area under ROC curve of 0.99 and confidence interval ranging from 0.94 to 1.

CONCLUSION

Multi-parametric MRI can potentially differentiate benign stromal tumors from malignant testicular neoplasms, which can help to avoid radical orchiectomy. However, future studies using larger sample sizes are needed to validate our results.

[French ccAFU guidelines - update 2020-2022: testicular germ cell tumors]

OBJECTIVE

- To update French guidelines concerning testicular germ cell cancer.

MATERIALS AND METHODS

- Comprehensive Medline search between 2018 and 2020 upon diagnosis, treatment and follow-up of testicular germ cell cancer and treatments toxicities. Level of evidence was evaluated.

RESULTS

- Testicular Germ cell tumor diagnosis is based on physical examination, biology tests (serum tumor markers AFP, hCGt, LDH) and radiological assessment (scrotal ultrasound and chest, abdomen and pelvis computerized tomography). Total inguinal orchiectomy is the first-line treatment allowing characterization of the histological type, local staging and identification of risk factors for micrometastases. In case of several therapeutic options, one must inform his patient balancing risks and benefits. Surveillance is usually chosen in stage I seminoma compliant patients as the evolution rate is low between 15 to 20%. Carboplatin AUC7 is an alternative option. Radiotherapy indication should be avoided. In stage I non seminomatous patients, either surveillance or risk-adapted strategy can be applied. Staging retroperitoneal lymphadenectomy has restricted indications. Metastatic germ cell tumors are usually treated by PEB chemotherapy according to IGCCCG prognostic classification. Lombo-aortic radiotherapy is still a standard treatment for stage IIA. Residual masses should be evaluated by biological and radiological assessment 3 to 4 weeks after the end of chemotherapy. Retroperitoneal lymphadenectomy is advocated for every non seminomatous residual mass more than one cm. 18FDG uptake should be evaluated for each seminoma residual mass more than 3 cm.

CONCLUSIONS

- A rigorous use of classifications is mandatory to define staging since initial diagnosis. Applying treatments based on these classifications leads to excellent survival rates (99% in CSI, 85% in CSII+).

Radical inguinal orchidectomy: the gold standard for initial management of testicular cancer

Radical inguinal orchidectomy with division of the spermatic cord at the internal inguinal ring is the gold standard for diagnosis and local treatment of testicular malignancies. The technique is well established and described in detail in this paper, collating methods from various surgical textbooks and articles. We also discuss pre-operative considerations including fertility counselling and potential testicular prosthesis at time of orchidectomy, and the importance of contemplating differential diagnoses such as para-testicular sarcoma and primary testicular lymphoma (PTL) prior to performing radical orchidectomy (RO). The evidence and indications for new surgical techniques to treat local testicular malignancies are also described, including testis sparing surgery (TSS) and spermatic cord sparing orchidectomy.

Intratesticular Leiomyoma: A Case Report

The majority of intratesticular masses are malignant. Although uncommon, benign lesions can be found as an intratesticular mass. An extremely rare lesion in the testicle is a leiomyoma, which has only been reported a handful of times in the literature. We report here a case of intratesticular leiomyoma, the associated imaging, and pathologic findings.

Rare Presentation of Burned-Out Testicular Seminoma

A 28 year old male who complained of abdominal pain over the past several months was found on CT to have lymphadenopathy along the right aspect of the inferior vena cava. The patient was subsequently seen by an oncologist where further work up of the lymphadenopathy was performed. A MR of the abdomen demonstrated right aortocaval and para-caval lymph nodes measuring to 3.7cm. A testicular ultrasound was then performed, which demonstrated an apparent peripheral focal hypoechoic region with no associated internal vascularity within the right testes. Biopsy of the retroperitoneal lymph nodes pathologically confirmed the diagnosis of seminoma. Keywords: Seminoma, Testicular Cancer, Retroperitoneal Adenopathy, Oncology, Burned-Out Tumor.

Pelvic lymph nodes and pathways of disease spread in male pelvic malignancies

PURPOSE

Accurate nodal staging for male urogenital malignancies has important implications for therapy and prognosis. Male pelvic malignancies, including prostatic, penile, testicular, and bladder cancer, typically metastasize to regional lymph nodes first which is reported by the N-stage. Spread beyond these groups to non-regional nodes is regarded as M-stage disease.

METHODS

In this review, we discuss the typical patterns of male pelvic lymphatic drainage and the tumor-specific regional nodal chains.

RESULTS

The impact of tumor-specific imaging features and the implications of previous treatments on staging are discussed.

CONCLUSIONS

While anatomic imaging, including CT and MRI, is the most widely employed imaging modality at present, newer functional imaging techniques have demonstrated promise in the accurate identification and characterization of nodal metastases.

Overview of ultrasound applications for assessing scrotal disorders

The scrotum may be affected by a plethora of different disorders such as infections, vasculopathies, trauma, and manifestations of primary and secondary malignant masses. In addition to the patient's medical history and clinical examination, ultrasound represents the imaging modality of choice to assess scrotal disorders. Time-consuming contrast-enhanced ultrasound and elastography can provide further information to distinguish between benign and malignant testicular mass lesions. The following invited Special Communication gives a comprehensive overview of differential diagnoses of the scrotum and their corresponding sonomorphologic correlates based on representative cases of the Interdisciplinary Ultrasound Center of the University Hospital Munich.

Intratesticular leiomyoma: A case report and a literature review

•

Testicular Leiomyomùa is a rare entity.

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Clinical presentation and physical examination are non specific, and cannot distinguish it from a testicular cancer.

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Imaging is based on ultrasound, which describes the features of the testicular leiomyoma precisely, but cannot make the diagnosis.

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Only pathological examination of the specimen after surgery can confirm the diagnosis.

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A frozen section of the mass followed by mass excision can lead to organ sparing surgery if the diagnosis is suspected intraoperatively.

Introduction

Leiomyomas are benign tumors that originate from smooth muscles cells. Intratesticular leiomyoma is a very rare type of benign testicular masses. Through the literature, only 11 cases were reported.

Presentation of case

A 36 years old man presented with painless right scrotal mass. Clinical examination showed right upper polar testicular mass, well circumscribed and highly vascularized on sonography. Serum tumor markers were normal. Patient was explained the possibility of an organ sparing surgery if frozen section shows no sign of malignancy. Midline incision with frozen section was performed, with wide local excision. Pathological examination of the specimen confirmed intratesticular leiomyoma. Two years after the surgery, patient showed no sign of recurrence.

Discussion

Intratesticular Leiomyoma is usually revealed as a non-tender firm scrotal mass that increases in size. Sonography is the imaging modality of choice for assessing intrascrotal pathology, and cannot distinguish benign from malignant tumor. Surgical management is subject of debate. While some authors recommend radical orchiectomy, others suggest the use of frozen section intraoperatively, and perform conservative treatment by mass excision in the absence of signs of malignancy.

Conclusion

Intratesticular leiomyoma is a very rare finding. When suspected, conservative management using frozen section followed by mass excision can be done, but final diagnosis remains on pathological examination and immunohistochemistry of the specimen.

Mechanism of metastasis to the spermatic cord and testis from advanced gastric cancer: a case report

BACKGROUND

The spermatic cord and testis are very rare sites for metastasis from gastric cancer. Although several mechanisms have been suggested to explain this unusual metastasis, the actual mechanism remains unclear. We report a case of right spermatic cord and testicular metastasis, review its imaging findings, and suggest a mechanism of tumor spread.

CASE PRESENTATION

A 61-year-old man complained of a palpable mass in the right inguinal area. He had been treated with distal gastrectomy with chemotherapy for advanced gastric cancer 5 years ago. Computed tomography, ultrasound, and magnetic resonance imaging showed a mass surrounding the right spermatic cord, involving the right testis. Another mass was observed in the aortocaval space, presumed to be a metastatic lymph node. The imaging features of the right testicular lesion were different than those of the primary testicular cancer. The lesions at both sites showed similar radiologic features of abundant internal necrosis, which is consistent with metastatic lesions. Pathology confirmed metastatic adenocarcinoma. He underwent a series of chemotherapy sessions, and all metastatic masses had partially decreased in size at the 5-month outpatient follow-up.

CONCLUSIONS

The imaging features of testicular mass and spermatic cord involvement are important clues for accurate differential diagnosis of metastasis from other primary tumors in patients with a history of stomach cancer. This unusual metastasis can be explained via retrograde tumor spread along the lymphatic channels in terms of concurrent aortocaval lymph node metastasis. A suspicion of metastasis should not be overlooked, even if a patient has undergone curative treatment, including surgery and adjuvant chemotherapy, many years ago.

Management of a patient with primary mucinous testicular adenocarcinoma as a rare case with adjuvant and metastatic sequential treatments

INTRODUCTION

Mucinous adenocarcinomas of the testicular surface epithelial tumors are very rare and are similar to malignant ovarian-type surface epithelial tumors. Although only 32 cases have been reported to date, there are only five cases of primary testicular mucinous carcinoma with access to literature in English. So there is still limited information about clinical, etiopathogenesis and treatment options.

CASE REPORT

In this article, we discuss a 56-year-old male patient diagnosed with testicular mucinous adenocarcinoma due to its rarity in the light of literature review.Management and outcome: We preferred cisplatin-paclitaxel regimen for adjuvant treatment. We then used sequential treatments including oxaliplatin, 5-fluorourasil, etoposide, gemcitabine, and docetaxel to treat metastatic disease. The patient underwent lung metastasectomy for the first relapse. The patient was diagnosed in November 2013 and the response to treatment was evaluated in December 2019 and stable disease was detected. The patient, who has a total survival of 73 months, is still under treatment.

DISCUSSION

Excluding malign transformation and borderline mucinous testicular tumors from mucinous cystadenomas of the testis, the knowledge on carcinogenesis, clinical course, and treatment of primary testicular mucinous adenocarcinomas is very limited.