[Multifocal tuberculosis simulating multimetastatic colon cancer in an immunocompetent black African patient: a case report]. / Tuberculose multifocale simulant un cancer du côlon multi-métastatique chez un Noir africain immunocompétent: à propos d´un cas.

Multifocal tuberculosis is rare in immunocompetent subjects. It is characterized by the involvement of at least two extra-pulmonary sites, associated or not with lung disease. It is often difficult to diagnose. We here report a case of multifocal tuberculosis in a non-immunocompromised black African subject at the Hubert Koutoukou Maga National Hospital and University Center (CNHU-HKM) in Cotonou, Benin. The study involved a 23-year-old man, with no particular previous history, admitted with diffuse abdominal pain associated with alteration of general state. Clinical examination showed severe malnutrition and medium-volume ascites. Imaging tests (chest X-ray, ultrasound and computed tomography (CT) scan) showed multiple lung, liver, pancreatic, bone, lymph nodes and colic lesions suggesting multimetastatic tumor. Colonoscopy then showed budding lesion of the cecum. GeneXpert test showed Koch´s bacilli. The anatomo-pathological examination of colic biopsies and GeneXpert sputum test confirmed multifocal tuberculosis. The patient received antituberculosis treatment and nutritional support. However he died. Multifocal tuberculosis is a serious disease that is difficult to diagnose. Then it is frequently mis-diagnosed in tropical areas, especially when it occurs in immunocompetent patients.

[Retinoblastoma in Senegal: Pathologist's view]. / Le rétinoblastome au Sénégal : point de vue du pathologiste.

OBJECTIVES: Describe the macroscopic and microscopic profiles of the retinoblastoma (RB) in Senegal and correlate histological criteria to evolution to emerge severity factors. METHODOLOGY: We realized a retrospective study on 10years (January 2005-December 2014). Only patients (n=67) who performed a histological analysis of the enucleation specimen (n=68) were followed until the end of the study. RESULTS: The tumor measured an average of 3.8cm (2/4.5). Endophytic tumor development was in 55 cases (80.8%), exophytic in 6 cases (8.9%) and mixed in 7 cases (10.3%). Extra-retinal form was present in 13 cases (19.2%). The RB was well differentiated in 11 cases (16.2%), moderately differentiated in 31 cases (45.6%) and undifferentiated in 26 cases. The invasion of optic nerve (ON) was present in 18 cases (26.5%). The tumor was extra-retinal in 37 cases (54.4%). The anterior chamber was invaded in 6 cases (8.8%). The global survival at 2years was 84% and 70% at 5years. In multivariate analysis, well tumor differentiation and stage pT1 were associated with remission. The other-laminar of ON invasion, the massive invasion of the choroid and pT3 stage were recurrence risk factors. The undifferentiating tumor, invasion of the ON section, tumor sclera crossing and pT4 stage were predictive death. CONCLUSION: The RB histological prognostic factors should be clearly identified in the pathological reports as they guide the after surgical period care and follow-up management strategy.

[A rare parotid tumor]. / Une tumeur parotidienne rare.

INTRODUCTION: Sebaceous lymphadenoma of the parotid (SLP) is a rare, benign tumor with similar epidemiological and macroscopic characteristics with other sebaceous differentiated tumors of the parotid (SDTP). The authors report a case of SLP in an 80-year-old woman. They then recall the distinctive histological and immunohistochemical criteria of SDTP. OBSERVATION: Mrs P. D. was received during a surgical consultation for the management of a painless right parotid swelling that has evolved for 10years, increasing slightly in volume. At admission, the mass was movable, firm with a healthy skin without facial paralysis or satellite lymphadenopathy. The surgical intervention performed removed a nodular mass measuring 7cm, encapsulated, yellowish. It was made of regular epithelial cells without atypia or mitoses organized in nests, trabeculae and massifs. This tumor also included small canalicular cystic dilatations associated with several islands of sebaceous glands. The stroma was dense lymphoid with follicles and germinal centers. The tumor cells were CK7+, P63+, MSA+ and had a Ki67<5%. The diagnosis of an SLP was retained. No additional therapy was performed. One year after surgery, the patient had no local recurrence or metastatic foci. CONCLUSION: SLP is a rare tumor with a particular histological and immunohistochemical profile. It is an epithelial tumor with sebaceous islands, a dense reactional lymphoid stroma, expression of luminal and basal epithelial markers and a low proliferation index.

[Muscular metastases from renal cell carcinoma]. / Métastases musculaires des carcinomes à cellules rénales.

Renal cell carcinoma can metastasize to several locations but rarely in muscles. However, this possibility must never be overlooked because muscle metastases may occur a very long time after the initial nephrectomy. So the post-operative follow-up, according to the recommendations, with thoraco-abdomino-pelvic imaging (computed tomography or nuclear magnetic resonance) allowing to detect metastases, including muscle metastases in the trunk, does not have to neglect the metastases located in the members. This search is based upon a thorough clinical examination, completed by targeted imaging in case of symptoms and/or palpable mass.

[Watermelon stomach: Chronic renal failure and/or imatinib?]. / Watermelon stomach : insuffisance rénale chronique et/ou Glivec(®) ?

Watermelon stomach or gastric antral vascular ectasia (GAVE) syndrome is an uncommon cause of sometimes severe upper gastro-intestinal bleeding. Essentially based on a pathognomonic endoscopic appearance, its diagnosis may be unrecognised because mistaken with portal hypertensive gastropathy, while treatment of these two entities is different. Its etiopathogeny remains still unclear, even if it is frequently associated with different systemic illnesses as hepatic cirrhosis, autoimmune disorders and chronic renal failure. The mechanism inducing these vascular ectasia may be linked with mechanical stress on submucosal vessels due to antropyloric peristaltic motility dysfunction modulated by neurohormonal vasoactive alterations. Because medical therapies are not very satisfactory, among the endoscopic modalities, argon plasma coagulation seems to be actually the first-line treatment because the most effective and safe. However, surgical antrectomy may be sometimes necessary. Recently GAVE syndrome appeared as a new adverse reaction of imatinib mesylate, one of the tyrosine kinase inhibitors used in chronic myeloid leukemia, and we report here the observation of such a pathology in one patient treated at the same time by haemodialysis and by imatinib mesylate for chronic myeloid leukemia.

Embryonal tumor with multilayered rosettes: diagnostic tools update and review of the literature.

Embryonal tumor with multilayered rosettes (ETMR), including embryonal tumor with abundant neuropil and true rosettes (ETANTR), and ependymoblastoma (EBL) constitute a distinct entity of the primitive neuroectodermal tumor (PNET) family. The presence of a focal amplification at chromosome region 19q13.42 associated with an up-regulation of the oncogenic miRNA cluster C19MC suggests that they may represent a histological spectrum of a single biological entity. Their histopathological spectrum is wide, including medulloepithelioma, their location may be supra- or infra-tentorial, their prognosis is poor. Recent data on molecular subgroups of PNETs have led to new insights on diagnosis and treatment of these tumors. Subsequently, LIN28A immunoexpression was identified as a highly specific marker for ETMR. In this study, we report 4 cases diagnosed initially as ETANTR with CGH-array data, including 19q13.42 gain with absence of other amplicons, particularly of the MYC gene family, and inconstant gain of whole chromosome 2. Immunohistochemical positive expression of LIN28A and absence of Olig2 expression were observed. We summarize the literature on ETMR, pointing out on the nosological evolution of this entity and the findings on genetic hallmarks of this particular tumor. Our results emphasize the usefulness of immunohistochemistry as a highly sensitive and fast diagnostic tool for ETMR and for genetic data, especially for 19q13.42 locus. Biological features may offer new therapeutic options for these embryonal tumors that do not usually respond to conventional treatments of PNETs.