Exploring the promising potential of induced pluripotent stem cells in cancer research and therapy

The advent of iPSCs has brought about a significant transformation in stem cell research, opening up promising avenues for advancing cancer treatment. The formation of cancer is a multifaceted process influenced by genetic, epigenetic, and environmental factors. iPSCs offer a distinctive platform for investigating the origin of cancer, paving the way for novel approaches to cancer treatment, drug testing, and tailored medical interventions. This review article will provide an overview of the science behind iPSCs, the current limitations and challenges in iPSC-based cancer therapy, the ethical and social implications, and the comparative analysis with other stem cell types for cancer treatment. The article will also discuss the applications of iPSCs in tumorigenesis, the future of iPSCs in tumorigenesis research, and highlight successful case studies utilizing iPSCs in tumorigenesis research. The conclusion will summarize the advancements made in iPSC-based tumorigenesis research and the importance of continued investment in iPSC research to unlock the full potential of these cells.

Designing Alginate/Chitosan Nanoparticles Containing Echinacea angustifolia: A Novel Candidate For Combating Multidrug-resistant Staphylococcus aureus

Nanoparticles (NPs) may help treat multidrug-resistant Staphylococcus aureus (MDR). This study prepared and evaluated chitosan/alginate-encapsulated Echinacea angustifolia extract against MDR strains. Evaluating synthesized NPs with SEM, DLS, and FTIR. Congo red agar and colorimetric plate techniques examined isolate biofilm formation. NP antibacterial power was assessed using well diffusion. Real-time PCR assessed biofilm-forming genes. MTT assessed the synthesized NPs' toxicity. According to DLS measurements, spherical E. angustifolia NPs had a diameter of 335.3 ± 1.43 nm. The PDI was 0.681, and the entrapment effectiveness (EE%) of the E. angustifolia extract reached 83.45 %. Synthesized NPs were most antimicrobial. S. aureus resistant to several treatments was 80 percent of 100 clinical samples. Biofilm production was linked to MDR in all strains. The ALG/CS-encapsulated extract had a 4 to 32-fold lower MIC than the free extract, which had no bactericidal action. They also significantly decreased the expression of genes involved in biofilm formation. E. angustifolia-encapsulated ALG/CS decreased IcaD, IcaA, and IcaC gene expression in all MDR strains (***p<0.001). Free extract, free NPs, and E. angustifolia-NPs had 57.5%, 85.5%, and 90.0% cell viability at 256 μg/ml. These discoveries could assist generate stable plant extracts by releasing natural-derived substances under controlled conditions.

Immunoinformatic prediction of potential immunodominant epitopes from cagW in order to investigate protection against Helicobacter pylori infection based on experimental consequences

Helicobacter pylori is a leading cause of stomach cancer and peptic ulcers. Thus, identifying epitopes in H. pylori antigens is important for disease etiology, immunological surveillance, enhancing early detection tests, and developing optimal epitope-based vaccines. We used immunoinformatic and computational methods to create a potential CagW epitope candidate for H. pylori protection. The cagW gene of H. pylori was amplified and cloned into pcDNA3.1 (+) for injection into the muscles of healthy BALB/c mice to assess the impact of the DNA vaccine on interleukin levels. The results will be compared to a control group of mice that received PBS or cagW-pcDNA3.1 (+) vaccinations. An analysis of CagW protein antigens revealed 8 CTL and 7 HTL epitopes linked with AYY and GPGPG, which were enhanced by adding B-defensins to the N-terminus. The vaccine's immunogenicity, allergenicity, and physiochemistry were validated, and its strong activation of TLRs (1, 2, 3, 4, and 10) suggests it is antigenic. An in-silico cloning and immune response model confirmed the vaccine's expression efficiency and predicted its impact on the immune system. An immunofluorescence experiment showed stable and bioactive cagW gene expression in HDF cells after cloning the whole genome into pcDNA3.1 (+). In vivo vaccination showed that pcDNA3.1 (+)-cagW-immunized mice had stronger immune responses and a longer plasmid DNA release window than control-plasmid-immunized mice. After that, bioinformatics methods predicted, developed, and validated the three-dimensional structure. Many online services docked it with Toll-like receptors. The vaccine was refined using allergenicity, antigenicity, solubility, physicochemical properties, and molecular docking scores. Virtual-reality immune system simulations showed an impressive reaction. Codon optimization and in-silico cloning produced E. coli-expressed vaccines. This study suggests a CagW epitopes-protected H. pylori infection. These studies show that the proposed immunization may elicit particular immune responses against H. pylori, but laboratory confirmation is needed to verify its safety and immunogenicity.

Photothermic therapy with cuttlefish ink-based nanoparticles in combination with anti-OX40 mAb achieve remission of triple-negative breast cancer

Immunostimulatory monoclonal antibodies (IS-mAb) have been proven to enhance the therapeutic effectiveness of various anticancer therapy. In the present investigation, we launched a separate combinational therapy for the treatment of triple-negative breast cancer (TNBC) using cuttlefish ink-based nanoparticles (CINPs) for photothermal therapy (PTT) and anti-OX40 antibody. Our goal was to increase the therapeutic response to the disease. CINPs were characterized by their physicochemical properties, which revealed that they had a hydrodynamic diameter ranging from 128 to 148 nm, a negative surface charge, and a high photothermal conversion efficiency under both in vitro and in vivo settings. In TNBC model, we evaluated the therapeutic effectiveness of the following groups: CINP-PTT + anti-OX40 Ab (G1), CINPs-PTT (G2), CINPs + anti-OX40 Ab (G3), anti-OX40 (G4) or PBS (G5). In each case, we assessed the efficacy of these groups against one another. The intratumor administration of all of the substances and therapies was performed. CINP-PTT + anti-OX40 Ab and CINP + anti-OX40 Ab (particularly CINP-PTT + anti-OX40 Ab) induced significant tumor regression in treated (breast) and non-treated (flank) tumor, and completely inhibited lung metastasis, thereby inducing a higher survival rate in mice in comparison to CINP-PTT, anti-OX40 Ab, or PBS. This was the case because in CINPs-treated tumors, particularly those treated with CINPs-PTT, intratumoral injection of CINPs increased the frequency of OX40, CD8 double-positive T cells. CINPs improved the conversion of the macrophage phenotype from M2 to M1 in vitro, which is significant from an immunological point of view. In addition, anti-OX40 Ab combined with CINPs or, more specifically, CINPs-PPT produced a larger frequency of preexisting and newly formed tumor-specific CD8 T cells, as well as an enhanced frequency of CD8 T cells infiltrating non-treated tumors, in comparison to respective monotherapies. When the data were taken into consideration as a whole, it seemed that CINPs-based PTT may effectively enhance the antitumor response effectiveness of anti-OX40 Ab.

Correlations between Overexpression of SOX2OT Long Non-coding RNA and Susceptibility to Breast Cancer

BACKGROUND AND OBJECTIVE

The SOX2OT lcnRNA has been recognized as a positive regulator in the transcription regulation of the SOX2 gene. Recent studies have approved the dysregulation of SOX2OT lncRNA expression patterns in some common cancer types, including esophageal, lung, and breast cancer. The objective of the present study was to investigate the correlation between overexpression of SOX2OT lcnRNA and susceptibility to breast cancer.

METHODS

SOX2OT lncRNA expression profiling in 15 breast cancer and normal tumour-adjacent breast tissue samples was performed by using qRT-PCR. To evaluate the diagnostic potential of the SOX2OT lncRNA, we performed ROC curve analyses.

RESULTS

The expression of SOX2OT lncRNA in patients suffering from breast cancer revealed a significant overexpression in comparison with the healthy group (P<0.001). Significantly, the elevated circulating SOX2OT lncRNA was found specific to breast cancer and could differentiate breast cancer from controls with 100% of both sensitivity and specificity. Based on the Kaplan- Meier analysis, there was no significant correlation between SOX2OT lcnRNA expression and overall survival.

CONCLUSION

The results confirmed the association between breast cancer and higher SOX2OT lncRNA expression. According to the ROC curve results, SOX2OT lcnRNA could be a new measurable indicator of the breast cancer and a potential therapeutic target for breast cancer patients.

A Comparative Study of HOTAIR Expression in Breast Cancer Patient Tissues and Cell Lines

Objective

Recent data suggest that increased levels of the HOTAIR long non-coding RNA (lncRNA) are involved in the development of various types of malignancy, including breast cancer. The aim of present study was to investigate HOTAIR lncRNA expression profile in breast cancer (BC) patients and cell lines.

Materials and Methods

In this experimental study, expression level of HOTAIR lncRNA was evaluated in BC and normal tissues of 15 patients as well as MDA-MB-231, MCF-7 and MCF-10A cell lines, using quantitative reverse- transcription polymerase chain reaction (qRT-PCR). HOTAIR lncRNA expression levels were estimated using 2^-ΔΔCt method. Further, receiver operating characteristic (ROC) curve analysis was done to evaluate the selected lncRNA diagnostic potential. The Cox’s proportional hazards regression model was performed to evaluate the predictive value of this lncRNA level in BC patients.

Results

The results of present study demonstrated no significant difference in the expression of HOTAIR lncRNA in MCF7 and MDA-MB-231 cancer cell lines compared to MCF-10A as normal cell line (P>0.05). However, we observed a significantly increase in the expression of HOTAIR in BC patients compared to normal tissues (P<0.001). Significant associations were found between gene expression and tumour size and margin. We found 91.1% sensitivity and 95.7% specificity of circulating HOTAIR with an area under the ROC curve of 0.969. The Kaplan-Meier analysis indicated significant correlation between HOTAIR expression and overall survival.

Conclusion

This study demonstrated that expression of HOTAIR is increased in BC and might be associated with its progression. According to these findings, HOTAIR expression could be proposed as biomarkers for BC early diagnosis and prognosis.

[Thyroid tuberculosis]

Thyroid is a rare localization of tuberculosis, and should be considered in the diagnosis of nodular lesion of the thyroid gland except for the complicated forms with collection in which the fine needle aspiration showed the acid fast bacilli on Ziehl-Neelson stain (Koch bacilli) and/or granulomatous inflammation with caseation necrosis. We report the case of a 70 year-old woman referred to the hospital with a diagnosis of endothoracic goiter without clinical signs of tuberculosis. The diagnosis was established after total thyroidectomy and histological exam. Six-month treatment with three antituberculous drugs was administered with a good outcome.

[Thoracic gossypibomas]

OBJECTIVES

Intrathoracic gossypiboma are exceptional, but diagnosis and treatment are difficult. The purpose of this study was to recall the clinical and radiological aspects of intrathoracic gosssyibomas and discuss the medicolegal consequences.

MATERIAL AND METHODS

From January 1990 to June 2003, eight cases of gossypiboma were treated in our unit. The patients were aged 31 to 60 years (mean 40.5). Six had a history of thoracic surgery and two a history of biliary surgery. Clinically, the main symptom was hemoptysia (7 patients, 87.5%). Four patients (50%) presented thoracic pain and one a pleurocutaneous fistula. The chest x-ray revealed a poorly delimited opacity in six patients, a liquid effusion in one and a raised left diaphragm in one. The thoracic scan performed in two patients demonstrated an air image in one and a liquid image in the other.

RESULTS

Surgical removal was difficult in all eight patients. Pulmonary parenchyma had to be sacrificed in certain patients. Two patients developed postoperative complications (one pneumothora and one thoracic wall infection).

CONCLUSION

The diagnosis of intrathoracic gossypiboma should be suggested in all patients with a pulmonary mass and a history of thoracic surgery, more rarely laparotomy. Prevention remains the best treatment.

[A rare cause of posterior mediastinal tumors: extramedullary hematopoiesis]

We report a case of a patient with intrathoracic extramedullary hematopoiesis presenting as a posterior mediastinal tumor, without associated myelofibrosis. Pathophysiology and the options for diagnosis and treatment in this condition are discussed.

[Chronic alveolar syndrome]

We report a case of primary pulmonary Hodgkin's disease in a 20 year-old woman. The chest x-ray showed a chronic alveolar syndrome. The diagnosis was established from a pulmonary biopsy. The radiological features and the options for diagnosis of primary pulmonary Hodgkin's disease are discussed.

[Cystic lymphangioma of the mediastinum. Seven cases]

Cystic lymphangioma of the mediastinum is an uncommon vascular tumor frequently discovered incidentally on chest x-ray exams. Radiology (CT and MRI) may suggest the diagnosis and allow an assessment of the operatives difficulties, but histology of the surgical specimen is required for precise diagnosis. Complete resection is the only treatment; in some patients resection was incomplete because of the infiltrating character of these tumors, leading to recurrence. We report seven cases of mediastinal localization with a review of literature.

[Pyothorax in pneumonectomy cavity. Apropos of 24 cases]

AIM OF THE STUDY

Describe as series of post-pneumonectomy empyema episodes, with or without bronchial fistula treated at the department of Thoracic Surgery, University of Ibn Sina, Rabat, Morocco.

PATIENTS, METHOD AND RESULTS

Twenty-four patients with post-pneumonectomy pyothorax cared for between 1991 and 2000 were reviewed retrospectively. There were 15 men and 9 women, mean age 34 years. Pneumonectomy was indicated for tuberculous pyothorax and destroyed lung (n = 8), 8 destroyed lung (n = 8), pulmonary aspergilloma (n = 2), pulmonary hydatidosis (n = 2), bronchial dilatation (n = 2), lung cancer (n = 1), and bullet wound (n = 1). The patients were divided into two groups according to presence or absence of bronchial fistula: group 1, 19 patients with without bronchial fistula, and group 2 5 with bronchial fistula. Fourteen patients in group 1 (73.7%) achieved definitive cure, 12 after drainage and washout (63%) at mean delay of 45 days and 2 after drainage and washout with thoracoplasty. Five patients did not respond to hospital drainage and washout and remained under definitive ambulatory drainage as they declined further surgical treatment. One death occurred in this group. Two patients in group 2 (40%) achieved definitive cure, one after daily aspiration, and the other after thoracoplasty. Two fistulae in one patient were treated with nitratage. For this patient, we also attempted revision of the bronchial stube via posterior throacotomy, the closure of the bronchial fistula using an intercostal muscle flap associated with thoracoplasty. All these methods failed. There were two deaths in this group.

CONCLUSION

Sixteen patients were definitively cured (66.6%). Eight patients (33.3%) remain in a chronic condition. Patients with pyothorax on a pneumonectomy cavity should be managed in specialized centers before reaching the chronic stage. Thoracomyoplasty with preparation of the cavity by thoracostomy should be proposed.

[Surgery for intra-bronchial foreign bodies]

OBJECTIVE

The aim of this study was to evaluate the results of surgical treatment of intra-bronchic foreign bodies after unsuccessful endoscopic extraction.

MATERIALS AND METHODS

Fifteen patients underwent surgical treatment of intra-bronchic foreign bodies in our department during a period of 10 years. There was 9 males and 6 females, the mean age was 20.27 years (range between 5 and 39 years), there were 8 right localizations and 7 left. The recurrent pulmonary infections were most frequent complaint of patients.

RESULTS

Twelve pulmonary resections (including one pneumonectomy) were necessary because of the importance of pulmonary parenchyma destruction. There was one post-operative complication (one empyema) and the peri-operative mortality was nul.

CONCLUSION

Surgical treatment of intra-bronchic foreign bodies must be used only after unsuccessful endoscopic extraction. The preventive measures are the best treatment.

[Intrathoracic textiloma caused by transdiaphragmatic migration after biliary surgery. Report of a case]

Intrathoracic textiloma is very rare and the transdiaphragmatic migration after abdominal surgery is exceptional. The diagnosis was suspected by history of surgery and radiology (CT), the treatment is only surgical. We report a case of intrathoracic textiloma after biliary surgery 30 years before and we describe the clinical, radiological features and treatment of this severe complication including clinical and medico-legal consequences.

[Malignant primary fibrous histiocytoma of the pleura]

Malignant fibrous histiocytoma (MFH) is a uncommon primary sarcoma, occurring exceptionally in the thoracic site. We report a case of malignant fibrous histiocytoma of the pleura in a 23-year-old man. The tumour was revealed by chest pain and alteration of the general state. A complete resection of the tumour histologically diagnosed as a malignant fibrous histiocytoma, with a right upper lobectomy was performed. No adjuvant treatment was proposed. The patient died 4 months after operation with cerebral metastasis.

CONCLUSION

MFH should be treated by wide surgical resection if technically feasible, the role of adjuvant treatment is not defined.

Early complications of thoracic endoscopic sympathectomy: a prospective study of 940 procedures

BACKGROUND

Thoracic endoscopic sympathectomy (TES) has become the surgical technique of choice for treating intractable palmar hyperhidrosis and is usually considered as a simple and safe procedure. To evaluate the complication rate of TES, we conducted a prospective study of peri- and postoperative complications.

METHODS

From 1995 to 1999, 467 consecutive patients were operated on for upper limb hyperhidrosis. There were 164 men and 303 women, ranging in age from 15 to 59 years (mean 31 years). In all but 5 cases, the procedure was bilateral. Eleven patients underwent a reoperation for failure; thus the total number of sympathectomies was 940. The procedure was performed in two stages in 182 patients and in one stage in 267 patients. All patients were seen 1 month after the operation.

RESULTS

There was no mortality. The mean postoperative hospital stay was 2.3 days in the group of patients who were operated on in two stages and 1.1 day in patients who were operated on in one stage. There were three major complications: one tear of the right subclavian artery and two chylothoraces. There were 25 cases (5.3%) of bleeding (300 to 600 mL) during dissection of the sympathetic trunk due to injury to an intercostal vein; in all cases it was controlled thoracoscopically. There were 12 pneumothoraces (1.3%) after removal of chest tubes. All of these were unilateral. Four required chest drainage for a period of less than 24 hours. One patient had a mild pleural effusion. Four patients had a unilateral partial Horner Syndrome (0.4%) that disappeared within 3 months in 2 patients. The other 2 patients were lost to follow-up. One patient complained of rhinitis.

CONCLUSIONS

Although morbidity was low, significant complications of TES occurred. Patients should be clearly warned that TES is not as minor a procedure as usually asserted. Complications as well as adverse effects should be considered when discussing this surgical indication.

[Diaphragmatic hydatidosis: Report of a series of 27 cases]

OBJECTIVES

To analyze the clinical, radiological and treatment of this rare disease and assess the results of surgical treatment by thoracotomy.

PATIENTS AND METHODS

In the period of 10 years (1990-1999), 27 patients (15 males and 12 females, mean age: 32,4) underwent surgical treatment for hydatid cyst of the diaphragm with or without other location. Clinical signs were chest pain and dyspnea. Diagnosis was by abdominal echography and thoracic CT in 82% of cases. Surgical treatment was given alone in 25 cases, completed by medical care in 2.

RESULTS

Diaphragmatic cyst was simple in 17 cases and complicated in 10: intrapleural rupture (4 cases), pulmonary hydatid cyst association (3 cases), hepatic cyst (2 cases) and disseminated form (1 case). Resection of the dome and pericystectomy were the used surgical procedures. Pneumothorax was the only post-operative complication (3.7%). The mortality was nil.

CONCLUSION

Diaphragmatic hydatidosis requires a careful topographic diagnosis between the lung, diaphragm, liver or abdominal localizations. Ultrasound and computed tomography are highly contributive. Surgery is the best treatment, thoracotomy being an excellent approach.

[Nephrobronchial fistula: a case report]

Nephrobronchial fistulas following pyonephrosis associated with urolithiasis are a rare occurrence. The possibility of severe problems arising during surgery should be taken into considerations; both the surgeon and the anesthetist should be fully informed of the specific risk factors involved. A favorable outcome mainly depends on the appropriate treatment and timely management of any thoracic complications. Although this rare pathology has been described in detail in the literature, the problems encountered during anesthesia and surgery have not been fully reported. This study therefore provides new data, as a case has been reported of a 38-year old female who underwent surgery for pyonephrosis; disease management and prognosis problems have been discussed.

[Treatment of hydatid bilio-bronchial and bilio-pleuro-bronchial fistulas by thoracotomy]

STUDY AIM

The aim of this study was to report the results of surgical treatment of hydatid bilio-bronchial et bilio-pleuro-bronchial fistulas via thoracotomy.

MATERIAL AND METHODS

From 1990 to 1998, 63 cases were observed in the same center. Biliptysis was the main symptom in 72% of cases. The diagnosis was based on chest radiography and abdominal ultrasonography; both examinations visualised the cyst, intrathoracic collections, a diaphragmatic breach and biliary lesions. All patients were treated by one-stage thoracotomy. The procedures consisted of lung resection (lobectomy and/or segmentectomy) (n = 47) and decortication (n = 16) in the chest, cyst dome resection (n = 61) or partial pericystectomy (n = 12) in the abdomen and suture of the diaphragmatic defect in all cases after hepato-diaphragmatic disconnection. An additional laparotomy was necessary in 4 cases.

RESULTS

There were 8 deaths (12.7%): one intraoperative death due to haemorrhage and seven postoperative deaths, mostly related to pulmonary complications. Postoperative complications (14.3%) were mainly respiratory. Clinical and radiological results were good with a one-year follow-up.

CONCLUSION

Bilio-bronchial and bilio-pleurobronchial fistulas due to hydatid cyst are rare, but severe diseases. They are responsible for lesions at three levels: abdominal, diaphragmatic and thoracic. A high perioperative mortality rate was observed. Thoracotomy is the best approach for surgical treatment at all three levels.

[Hydatid thymic cyst. A case report]

Hydatid thymic cyst is exceptional. The diagnosis is suspected by radiology and epidemiology. Serology tests provide variable results and surgery is the only treatment. We report a case of thymic hydatid cyst in a 20-year-old man who had no other localizations. Diagnosis was confirmed at surgery and by histology.

[Pulmonary aspergilloma: results of surgical treatment. Report of a series of 206 cases]

STUDY AIM

The aim of this retrospective study was to report the results of the surgical treatment in 188 patients operated on for pulmonary aspergilloma in a series of 206 patients observed in Morocco.

PATIENTS AND METHOD

From 1982 to 1998, 206 patients were treated for pulmonary aspergilloma in the same hospital; 188 were operated on and surgery was contraindicated in the other patients with general or respiratory failure. Hemoptysis was the main symptom, present in 190 patients (92%). Surgery was performed on principle with 108 lobectomies, 38 segmentectomies, 18 lobectomies and segmentectomies, 21 pleuropneumonectomies and 3 thoracoplasties.

RESULTS

Postoperative complications occurred in 36% of the patients including: pyothorax (n = 15), hemothorax (n = 10), rehabitation defects (n = 17) and respiratory failure (n = 10). Reoperation was necessary in 6 patients. Postoperative mortality rate was 6.4% (12 patients including 5 treated by pleuro-pneumonectomy).

CONCLUSION

The surgical treatment, in spite of its high morbidity, has to be proposed to all patients with pulmonary aspergilloma, even in asymptomatic patients when there is no surgical contraindication. Pleuropneumonectomy is a very high risk procedure and its indications must be restricted. Thoracoscopy was rarely performed in this series.

[Descending necrotizing mediastinitis. A case report]

Descending necrotizing mediastinitis which may occur as a complication of neglected oropharynx infection is an uncommon disease, although it is lethal in most cases. Trismus and dyspnea are usual with palpable crepitation located in the cervico-thoracic area. Early diagnosis can be confirmed with accuracy by CT scan. Treatment is based on early mediastinal drainage by cervical approach, intravenous antibiotics and reanimation. The reported case had a favorable outcome.

[Malignant small-cell thoracic pulmonary tumor (Askin tumor)]

We report 4 cases of malignant thoraco-pulmonary small-cell tumors (Askin tumor). Only two cases were operated. We emphasize the difficult histological diagnosis and demonstrate the importance of complete removal for survival. Prognosis remains poor.

[Inflammatory pseudotumor of the lung. An anatomoclinical study of a case report]

One solitary pulmonary nodule was observed in a 47-year-old woman with history of right thigh liposarcoma 1 year before. Histological examination of the pulmonary specimen excluded liposarcoma metastasis and revealed an inflammatory pseudotumor. These unusual lesions with an excellent prognosis may exhibit, as in our case, atypical radiologic features and nuclear atypia, making the diagnosis difficult with malignancy.

Primary psoas abscess. A review of 16 cases

OBJECTIVE

Most psoas abscesses are secondary. The objective of this study was to report on the clinical features, diagnosis and treatment of primary psoas abscess.

METHODS

We retrospectively studied 16 cases seen over a ten-year period (1987-1997) and compared our findings to published data.

RESULTS

There were 14 men and two women, with a mean age of 6 years (range, 17-57 years). The right side was affected in nine cases, the left side in six, and both sides in one. Fever, pain and psoas spasm were the presenting symptoms. Laboratory tests for inflammation were positive; four patients had a high neutrophil count. Ultrasonography demonstrated a fluid collection in the psoas in 13 patients. A computed tomography scan was done in 14 patients and showed either a fluid collection (n = 11) or a presuppurative abscess (n = 3). Magnetic resonance imaging was not used. The organism was recovered in nine patients and was a Staphylococcus aureus in seven, an Escherichia coli in one and a Pseudomonas aeruginosa in one. The Brucella agglutination test was strongly positive in two patients. Findings were negative from investigations done to look for a cause (discitis, urinary tract infection, Crohn's disease, ulcerative colitis, malignancy or infection in the vicinity of the psoas muscle). All patients received antimicrobial therapy. Drainage was percutaneous in six patients and surgical in ten. The outcome was favorable in every case.

[Arterial complications of Behcet's disease. Report of 13 cases]

Vascular involvement, usually venous thrombosis, is common in Behçet's disease. Arterial manifestations, usually aneurysms or more rarely occlusion, are less common. We analyzed 13 cases of Behçet's disease with arterial complications. This fourth series in the literature was collected over 11 years. There were 12 men and 1 woman, mean age 41 +/- 7 years. Mean delay to arterial complications was 5.8 years (maximum 20 years) after the first sign of the disease. In the 13 patients in our series, there were a total of 18 arterial lesions, including one aneurysm and one stenosis of the internal carotid artery. There were 2 cases (10%) with lesions of the aorta (aneurysms). Approximately half of the arterial lesions (7/18) involved the femoral artery. There were 11 localizations on the femoropopliteal axis (11 aneurysms). One aneurysm of the humeral artery was the only localization in the upper limb. Vascular involvement was limited to arterial lesions in 9/13 patients with multiple lesions at different localizations in 2 patients. In two others, a second arterial localization occurred secondarily. All patients except one were operated. Mid-term complications are: 1 death and 4 thrombi including 3 with good results after reoperation. In these patients with Behçet's disease, risk of severe complications is important, requiring long-term surveillance.

[Degenerated Buschke Loewenstein tumor of the scrotum]

The Buschke-Loewenstein tumour (BLT) is a sexually transmissible benign tumour of viral origin. It is characterized by a large tumour volume, the possibility of local recurrence and especially its potential for malignant transformation. We report a case of scrotal BLT in a 49-year-old patient with a history of recurrent scrotal fistula, with negative HIV serology, but in whom the search for Human Papilloma Virus (HPV) was not performed. The tumour arising from the scrotal skin was resected and the testis was found to be normal. Histology confirmed transformation of the tumour into a squamous cell carcinoma. The clinical course was favourable, after a follow-up of 8 months with no local recurrence. In the light of this case of rare tumour, especially in its malignant form and its unusual scrotal site, the authors review the problems related to clinical classification, histology (differential diagnosis with primary squamous cell carcinoma), clinical course and treatment raised by this tumour.

[Paratesticular rhabdomyosarcomas. Apropos of a case]

A case of paratesticular rhabdomyosarcoma in a 23 year-old patient is reported. Clinical signs are like any intrascrotal tumor. Scrotal ultrasound, CT scan and immunohistochemical markers are necessary for the diagnosis and stadification of this cancer. Orchidectomy followed by radiotherapy and/or chemotherapy is the usual treatment. Prognosis depends on the tumoral stage.