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Huang W, Zheng Z, Bao Z, Xiao X, Li L, Sun Z, Kang L. A poor prognostic male choriocarcinoma with multiple systemic metastases: a case report and the literature review. Front Med (Lausanne) 2024; 11:1382672. [PMID: 38572155 PMCID: PMC10989191 DOI: 10.3389/fmed.2024.1382672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Accepted: 03/08/2024] [Indexed: 04/05/2024] Open
Abstract
Background Non-gestational choriocarcinoma, also known as primary choriocarcinoma, is extremely rare in men, manifesting with specific signs such as breast feminization, testicular atrophy, and loss of libido. The presentation typically includes elevated serum β-hCG levels, widespread metastatic disease, and a rapid progression of the condition. Case report We present a rare case of a 41-year-old man diagnosed with choriocarcinoma, exhibiting a unique combination of multiple metastases, including lung, brain, bone, and retroperitoneal lymph node metastases, as confirmed by 18F-FDG PET/CT imaging. The patient was treated with aggressive chemotherapy and pembrolizumab, and the prognosis remained poor. The patient's overall survival was a mere 5 months following diagnosis. Conclusion Non-gestational choriocarcinoma represents a rare entity in clinical practice and should be considered in young men presenting with gynaecomastia and elevated β-hCG levels alongside normal gonads. Thus, we advocate for a more comprehensive inquiry into medical history and a systematic examination. The 18F-FDG PET/CT examination not only visually delineates the lesion's location and extent but also serves as a cornerstone for clinical tumor staging, providing valuable support for treatment monitoring and subsequent follow-up.
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Affiliation(s)
- Wenpeng Huang
- Department of Nuclear Medicine, Peking University First Hospital, Beijing, China
| | - Zuohuan Zheng
- Department of Traditional Chinese Medicine, The Seventh People’s Hospital of Chongqing, Chongqing, China
| | - Zheng Bao
- Department of Nuclear Medicine, Peking University First Hospital, Beijing, China
| | - Xiaoyan Xiao
- Department of Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
| | - Liming Li
- Department of Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
| | - Zhaonan Sun
- Department of Medical Imaging, Peking University First Hospital, Beijing, China
| | - Lei Kang
- Department of Nuclear Medicine, Peking University First Hospital, Beijing, China
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Bezzi C, Monaco L, Ghezzo S, Mathoux G, Bergamini A, Zambella E, Fallanca F, Samanes Gajate AM, Presotto L, Sabetta G, Mangili G, Cioffi R, Bettinardi V, Gianolli L, Mapelli P, Picchio M. 18F-FDG PET/CT May Predict Tumor Type and Risk Score in Gestational Trophoblastic Disease. Clin Nucl Med 2022; 47:525-531. [PMID: 35353763 DOI: 10.1097/rlu.0000000000004135] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
PURPOSE The aim of this study was to investigate the role of 18F-FDG PET/CT in predicting pathological prognostic factors, including tumor type and International Federation of Gynecology and Obstetrics (FIGO) score, in gestational trophoblastic disease (GTD). METHODS Retrospective monocentric study including 24 consecutive patients who underwent to 18F-FDG PET/CT from May 2005 to March 2021 for GTD staging purpose. The following semiquantitative PET parameters were measured from the primary tumor and used for the analysis: maximum standardized uptake value (SUVmax), SUVmean, metabolic tumor volume (MTV) and total lesion glycolisis (TLG). Statistical analysis included Spearman correlation coefficient to evaluate the correlations between imaging parameters and tumor type (nonmolar trophoblastic vs postmolar trophoblastic tumors) and risk groups (high vs low, defined according to the FIGO score), whereas area under the curve (AUC) of the receiver operating characteristic (ROC) curve was used to assess the predictive value of the PET parameters. Mann-Whitney U test was used to further describe the parameter's potential in differentiating the populations. RESULTS SUVmax and SUVmean resulted fair (AUC, 0.783; 95% confidence interval [CI], 0.56-0.95) and good (AUC, 0.811; 95% CI, 0.59-0.97) predictors of tumor type, respectively, showing a low (ρ = 0.489, adjusted P = 0.030) and moderate (ρ = 0.538, adjusted P = 0.027) correlation. According to FIGO score, TLG was instead a fair predictor (AUC, 0.770; 95% CI, 0.50-0.99) for patient risk stratification. CONCLUSIONS 18F-FDG PET parameters have a role in predicting GTD pathological prognostic factors, with SUVmax and SUVmean being predictive for tumor type and TLG for risk stratification.
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Affiliation(s)
| | | | | | | | | | | | - Federico Fallanca
- Nuclear Medicine Department, IRCCS San Raffaele Scientific Institute
| | | | - Luca Presotto
- Nuclear Medicine Department, IRCCS San Raffaele Scientific Institute
| | - Giulia Sabetta
- Unit of Obstetrics and Gynaecology, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Giorgia Mangili
- Unit of Obstetrics and Gynaecology, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Raffaella Cioffi
- Unit of Obstetrics and Gynaecology, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | | | - Luigi Gianolli
- Nuclear Medicine Department, IRCCS San Raffaele Scientific Institute
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Mamouni N, Boumhaoued S, Erraghay S, Boubou M, Bouchikhi C, Banani A. [Clinical and radiological features of gestational trophoblastic tumors]. Pan Afr Med J 2018; 28:228. [PMID: 29629014 PMCID: PMC5882204 DOI: 10.11604/pamj.2017.28.228.13267] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 10/31/2017] [Indexed: 11/11/2022] Open
Abstract
Gestational trophoblastic disease incorporates a group of diseases which differ from each other by their regressive evolution, their evolution to metastasis and to recurrence. It is a severe disease that affects women of childbearing age. Gestational trophoblastic tumors (GTT) are the malignant forms of gestational trophoblastic diseases. They are always a result of pregnancy, more often molar pregnancy (hydatidiform mole). The most common type of gestational trophoblastic tumors (GTT) is the invasive mole because, in most cases, the diagnosis is made when cancer is still confined to the uterus. Choriocarcinoma is a more rare type of tumor, often developing distant metastases. When there is a progression to a trophoblastic tumor, the assessment of locoregional extension and distant metastases is essential to establish an appropriate treatment protocol. We here report three clinical cases of GTT by describing their clinical presentations and the use of imaging techniques in the diagnosis and management of these disorders.
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Affiliation(s)
- Nisrine Mamouni
- Service de Gynécologie Obstétrique I, Hôpital Mère Enfant, CHU Hassan II, Fès, Université sidi Mohamed ben Abdellah, Maroc
| | - Siham Boumhaoued
- Service de Gynécologie Obstétrique I, Hôpital Mère Enfant, CHU Hassan II, Fès, Université sidi Mohamed ben Abdellah, Maroc
| | - Sanae Erraghay
- Service de Gynécologie Obstétrique I, Hôpital Mère Enfant, CHU Hassan II, Fès, Université sidi Mohamed ben Abdellah, Maroc
| | - Meriem Boubou
- Service de Radiologie, Hôpital Mère Enfant, Hôpital Mère Enfant, CHU Hassan II, Fès, Université sidi Mohamed ben Abdellah, Maroc
| | - Chahrazed Bouchikhi
- Service de Gynécologie Obstétrique I, Hôpital Mère Enfant, CHU Hassan II, Fès, Université sidi Mohamed ben Abdellah, Maroc
| | - Abdelaziz Banani
- Service de Gynécologie Obstétrique I, Hôpital Mère Enfant, CHU Hassan II, Fès, Université sidi Mohamed ben Abdellah, Maroc
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4
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Abstract
Choriocarcinoma is a cancer that usually occurs in the uterus during pregnancy. Extragonadal choriocarcinoma, although very rare, can occur. The diagnostic dilatation and curettage of the uterus in a 28-year-old woman who had vaginal bleeding and elevated human chorionic gonadotrophin level failed to identify any abnormality. FDG PET/CT revealed abnormal activity in the head of the pancreas. Pathological examination after partial pancreatectomy demonstrated primary choriocarcinoma in the pancreas.
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5
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Feng F, Xiang Y. Surgical management of chemotherapy-resistant gestational trophoblastic neoplasia. Expert Rev Anticancer Ther 2014; 10:71-80. [DOI: 10.1586/era.09.169] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Mapelli P, Mangili G, Picchio M, Gentile C, Rabaiotti E, Giorgione V, Spinapolice EG, Gianolli L, Messa C, Candiani M. Role of 18F-FDG PET in the management of gestational trophoblastic neoplasia. Eur J Nucl Med Mol Imaging 2013; 40:505-13. [PMID: 23314259 DOI: 10.1007/s00259-012-2324-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Accepted: 12/10/2012] [Indexed: 12/13/2022]
Abstract
PURPOSE Gestational trophoblastic neoplasia (GTN) is a rare and aggressive tumour that is usually sensitive to chemotherapy. The usefulness of conventional imaging modalities in evaluating treatment response is limited, mainly due to the difficulty in differentiating between residual tumour tissue and necrosis. The aim of the present study was to evaluate the role of FDG PET or PET/CT in primary staging and in monitoring treatment efficacy. The effect of FDG PET and combined PET/CT on the management of patients with GTN was also evaluated comparing the differences between standard treatments based on conventional imaging and alternative treatments based on PET. METHODS This retrospective study included 41 patients with GTN referred to San Raffaele Hospital between 2002 and 2010. All patients were studied by either PET or PET/CT in addition to conventional imaging. Of the 41 patients, 38 were evaluated for primary staging of GTN and 3 patients for chemotherapy resistance after first-line chemotherapy performed in other Institutions. To validate the PET data, PET and PET/CT findings were compared with those from conventional imaging, including transvaginal ultrasonography (TV-US) in those with uterine disease, CT and chest plain radiography in those with lung disease and whole-body CT in those with systemic metastases. Conventional imaging was considered positive for the presence of uterine disease and/or metastases when abnormal findings relating to GTN were reported. PET and PET/CT were considered concordant with conventional imaging when metabolic active disease was detected at the sites corresponding to the pathological findings on conventional imaging. In addition, in 12 of the 41 patients showing extrauterine disease, FDG PET/CT was repeated to monitor treatment efficacy, in 8 after normalization of beta human chorionic gonadotropin (βHCG) and in 4 with βHCG resistance. In some patients, PET or PET/CT findings led to an alternative nonconventional treatment, and this was considered a change in patient management for the study analysis. RESULTS When compared to TV-US, chest radiography and CT for staging, PET showed a concordance in 91 %, 84 % and 81 % of patients, respectively. In 8 of the 41 patients with extrauterine disease during staging, PET/CT showed a complete response to therapy after βHCG normalization. PET and PET/CT identified the sites of persistent disease in all seven high-risk patients with βHCG resistance, of whom four underwent second-line chemotherapy, two surgical removal of resistant disease instead of additional chemotherapy, and one surgical removal of resistant disease and second-line chemotherapy with subsequent negative βHCG. CONCLUSION In staging, PET cannot replace conventional imaging and does not show any information in addition to that shown by conventional imaging. The additional value of PET/CT in GTN with respect to conventional imaging is found in patients with high-risk disease. PET can identify the sites of primary and/or metastatic disease in patients with persistent high levels of βHCG after first-line chemotherapy and may be of additional value in patient management for guiding alternative treatment.
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Affiliation(s)
- P Mapelli
- Department of Nuclear Medicine, San Raffaele Scientific Institute, Milan, Italy
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Kani KK, Lee JH, Dighe M, Moshiri M, Kolokythas O, Dubinsky T. Gestatational trophoblastic disease: multimodality imaging assessment with special emphasis on spectrum of abnormalities and value of imaging in staging and management of disease. Curr Probl Diagn Radiol 2012; 41:1-10. [PMID: 22085657 DOI: 10.1067/j.cpradiol.2011.06.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Gestational trophoblastic disease is a spectrum of disorders of varying malignant potential arising from trophoblastic cells and encompassing hydatidiform moles and persistent trophoblastic neoplasia. Ultrasound is the initial imaging investigation of choice when gestational trophoblastic disease is suspected. Complete hydatiform mole, the most common form of molar pregnancy, usually has a characteristic "cluster of grapes" appearance, especially on second-trimester ultrasounds. Persistent trophobastic neoplasia usually appears as a focal, hypervascular myometrial mass on pelvic ultrasound. Pelvic magnetic resonance imaging is often used as a problem-solving tool in equivocal or complicated cases of gestational trophoblastic disease to assess the degree of invasion into the myometrium and surrounding tissues. Chest x-ray, brain magnetic resonance imaging, and body computed tomography scans are primarily used for the evaluation of metastatic disease, which usually occurs in the context of choriocarcinomas. Choriocarcinoma metastases are usually hypervascular and have a tendency to bleed, features that are reflected in their imaging appearance.
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Thomakos N, Rodolakis A, Belitsos P, Zagouri F, Chatzinikolaou I, Dimopoulos AM, Papadimitriou CA, Antsaklis A. Gestational trophoblastic neoplasia with retroperitoneal metastases: a fatal complication. World J Surg Oncol 2010; 8:114. [PMID: 21192785 PMCID: PMC3023729 DOI: 10.1186/1477-7819-8-114] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Accepted: 12/30/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Gestational Trophoblastic Neoplasia (GTN) is a pathologic entity that can affect any pregnancy and develop long after the termination of the pregnancy. Its course can be complicated by metastases to distant sites such as the lung, brain, liver, kidney and vagina. The therapeutic approach of this condition includes both surgical intervention and chemotherapy. The prognosis depends on many prognostic factors that determine the stage of the disease. CASE REPORT We present a woman with GTN and retroperitoneal metastatic disease who came to our department and was diagnosed as having high risk metastatic GTN. Accordingly she received chemotherapy as primary treatment but unfortunately developed massive bleeding after the first course of chemotherapy, was operated in an attempt to control bleeding but finally succumbed. CONCLUSION This case demonstrates that GTN, while usually curable, can be a deadly disease requiring improved diagnostic, treatment modalities and chemotherapeutic agents. The gynaecologist should be aware of all possible metastatic sites of GTN and the patient immediately referred to a specialist center for further assessment and treatment.
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Affiliation(s)
- Nikolaos Thomakos
- Department of Clinical and Therapeutics, Alexandra Hospital, School of Medicine, University of Athens, Greece
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10
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Sone T, Yoshikawa K, Fukunaga M. Pulmonary tumor embolism from choriocarcinoma: detection with F-18 FDG positron emission tomography. Clin Nucl Med 2008; 33:773-4. [PMID: 18936610 DOI: 10.1097/rlu.0b013e318187f0d7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Teruki Sone
- Department of Nuclear Medicine, Kawasaki Medical School, Okayama, Japan.
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11
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Yamamoto Y, Maeda N, Fukaya T. Positron emission tomography/computed tomography evaluation for choriocarcinoma. Int J Gynaecol Obstet 2008; 104:149-50. [PMID: 18992881 DOI: 10.1016/j.ijgo.2008.08.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2008] [Revised: 08/28/2008] [Accepted: 08/28/2008] [Indexed: 10/21/2022]
Affiliation(s)
- Yorito Yamamoto
- Department of Obstetrics and Gynecology, Kochi Medical School, Kohasu, Oko, Nankoku, Kochi, Japan.
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12
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Bachmann J, Ernestus K, Werner T, Garnier Y, Mallmann P, Pietsch C, Schicha H, Schmidt M. Detection of primary choriocarcinoma in the mediastinum by F-18 FDG positron emission tomography. Clin Nucl Med 2007; 32:663-5. [PMID: 17667449 DOI: 10.1097/rlu.0b013e3180a1ac9d] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
A 31-year-old woman with a history of infection with human papilloma virus was found to have an elevated human chorionic gonadotropin level (beta-HCG) of more than 9000 IU/L in January 2006. The patient reported an irregular menstrual cycle. Extensive clinical work-up including gynecologic examinations with laparoscopy, hysteroscopy, and curettage were performed but no pathologic explanation of this elevated beta-HCG could be found. In the initial computed tomography (CT) of the abdomen and the thorax, a tumor could not be detected. Based on a clinical decision, chemotherapy with methotrexate in a dose of 1 mg/kg body weight was started. Four months after beginning of the chemotherapy the beta-HCG level dropped to 3048 IU/L. At this time a first F-18 FDG PET was performed and the findings were negative. After completion of 7 cycles of chemotherapy the beta-HCG level rose again. In a second F-18 FDG PET in August 2006 focal, intense and pathologic F-18 FDG accumulation with a SUV max. of 5.4 was seen in the mediastinum in the region of the thymus. At this time the beta-HCG level was 7000 IU/L. In a subsequent CT of the chest a retrosternal mass of 4 x 1.7 cm was detected with contrast enhancement. Resection of the tumor and thymus gland demonstrated a choriocarcinoma in part adjacent to the thymus and in part in the thymus. Postoperative beta-HCG levels dropped to 105 IU/L.
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Affiliation(s)
- Juliane Bachmann
- Department of Nuclear Medicine, University Hospital of Cologne, Cologne, Germany.
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Huang CY, Chen CA, Hsieh CY, Cheng WF. Intracerebral hemorrhage as initial presentation of gestational choriocarcinoma: a case report and literature review. Int J Gynecol Cancer 2007; 17:1166-71. [PMID: 17425677 DOI: 10.1111/j.1525-1438.2007.00934.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Choriocarcinoma is the most malignant tumor of gestational trophoblastic neoplasia. It grows rapidly and metastasizes to the lung, liver, and, less frequently, to the brain. One rare case of metastatic cerebral choriocarcinoma with initial presentation of intracerebral hemorrhage is reported. A 40-year-old woman initially presented sudden onset of headache. Intracerebral hemorrhage resulting from ruptured pseudoaneurysm was suspected. Emergent surgery with excision of the pseudoaneurysms was performed. Metastatic choriocarcinoma was accidentally found with positive immunohistochemical staining of cytokeratin and β subunit of human chorionic gonadotropin (β-HCG). Choriocarcinoma with brain metastases was diagnosed. She then received chemotherapy with regimen of etoposide, methotrexate, actinomycin-D, cyclophosphamide, and vincristine (EMACO). Elevated serum β-HCG (30.3 mIU/mL) and new pulmonary lesions were noted by computed tomography 4 months after completion of EMACO. Salvage chemotherapy with etoposide, methotrexate, actinomycin-D, etoposide, and cisplatin (EMAEP) regimen was given. Seven months later after completion of EMAEP, two new pulmonary lesions were detected by positron emission tomography (PET) scan. So she received video-assisted thoracoscopic surgery with tumor excision. Pathologic report confirmed the diagnosis of lung metastases. The patient recovered well. She is free of disease for 12 months. The diagnosis of metastatic cerebral choriocarcinoma was only made by histopathology after craniotomy. Metastatic choriocarcinoma should be always in the differential diagnosis for women at childbearing age presenting with unexplained stroke-like symptoms. In addition, PET scan may be valuable in detecting occult metastatic lesions of choriocarcinoma.
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Affiliation(s)
- C-Y Huang
- Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, Taiwan
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Allen SD, Lim AK, Seckl MJ, Blunt DM, Mitchell AW. Radiology of gestational trophoblastic neoplasia. Clin Radiol 2006; 61:301-13. [PMID: 16546459 DOI: 10.1016/j.crad.2005.12.003] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2005] [Revised: 10/26/2005] [Accepted: 12/05/2005] [Indexed: 12/20/2022]
Abstract
Gestational trophoblastic neoplasia (GTN) encompasses a broad spectrum of placental lesions from the pre-malignant hydatidiform mole (complete and partial) through to the malignant invasive mole, choriocarcinoma and rare placental site trophoblastic tumour (PSTT). Ultrasound remains the radiological investigation of choice for initial diagnosis, and it can also predict invasive and recurrent disease. Magnetic resonance imaging is of invaluable use in assessing extra-uterine tumour spread, tumour vascularity, and overall staging. Positron emission tomography and computed tomography undoubtedly have a role in recurrent and metastatic disease, while angiography has a place in disease and complication management. This review will describe the relevant pathophysiology and natural history of GTN, and the use of imaging techniques in the diagnosis and management of these conditions.
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Affiliation(s)
- S D Allen
- Department of Radiology, Charing Cross Hospital, Hammersmith Hospitals NHS Trust, London, UK
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Cho YJ, Lee SW, Lee SM, Yim JJ, Yoo CG, Han SK, Shim YS, Kim YW. A Case of Primary Choriocarcinoma of the Lung. Tuberc Respir Dis (Seoul) 2006. [DOI: 10.4046/trd.2006.61.6.578] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Young-Jae Cho
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Sei Won Lee
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Sang Min Lee
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jae-Joon Yim
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Chul-Gyu Yoo
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Sung Koo Han
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Young-Soo Shim
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Young Whan Kim
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
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