Objective: Making the interest of using immunohistochemistry clear in addition to histological test in the diagnosis of lymphomas. Methods: This is a retrospective study from January 2011 to June 2013 involving 18 cases of lymphomas collected in the teaching hospitals of Treichville and Yopougon. Results: 1) 38.88% diagnosis of LMNH B large-cell in histology against 38.88% LDGCB with IHC. 2) 11.11% diagnosis of LMNH small cell in histology against 11.11% with IHC. 3) 5.55% diagnosis of T lymphoma in histology against 27.77% diagnosis of T lymphoma with IHC. 4) 5.55% diagnosis of follicular lymphoma in histology against 11.11% diagnosis of LF with IHC. 5) 11.11% diagnosis of Burkitt lymphoma in histology against 5.55% diagnosis of LB with IHC. 6) 5.55% diagnosis of medullary hypoplasia in histology against 5.55% diagnosis of Hodgkin's disease. Our results confirm the contribution of immunohistochemistry in the diagnosis of lymphomas in addition to histological test. This is striking, especially as there is 27.77% of T lymphoma with immunohistochemistry against only 5.55% with histology.

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Background : Riedel's thyroiditis (RT) is a rare fibrosclerotic disease that affects the thyroid gland and surrounding tissues. The etiology is unknown, and it rarely affects the elderly.Case Presentation : A 56-year-old man, with no particular medical history, was seen in consultation at the Surgery Department of the Treichville Teaching University Hospital for a painless swelling of the anterior base of the neck. Physical examination showed a patient with inspiratory dyspnea probably due to tracheal compression. The patient underwent a subtotal thyroidectomy because of the clinical symptomatology and the persistence of dyspnea. Macroscopically, the thyroid mass was well-encapsulated, weighed 80g, and measured 10 cm x 5 cm x 2 cm. After section, we observed whitish fibrous nodules associated with pinkish-brownish band. Histologically, the architecture of thyroid tissue was restructured by dense and diffuse collagenous fibrosis in which rare atrophic thyroid vesicles were found. The fibrous areas were infiltrated by inflammatory elements, including lymphocytes, plasmocytes, and eosinophilic polynuclear cells. No malignant cells were found. Masson's trichrome staining confirmed the fibrous nature of the thyroid tissue, which is essential for the certain diagnosis of Riedel's thyroiditis. There was no postoperative complication Conclusion : Riedel's thyroiditis is a rare disease that is difficult to diagnose preoperatively despite advances in imaging and fine needle cytology screening methods. Histological examination of the sample confirms the diagnosis of Riedel's thyroiditis. Thyroidectomy is indicated in patients with compression symptoms. Clinicians should suspect Riedel's thyroiditis in patients with a hard thyroid mass with compressive symptoms, despite its rarity.

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It was about a 61-year-old patient who presented an indurated and painless umbilical swelling surrounded by ulcerated plaque and an abdominal arch progressing for 8 months. Abdomino-pelvic ultrasound and abdominal-pelvic CT scan revealed in right ovarian the presence of a mass with a cystic's tissue, a thickness with a subcutaneous infiltration of the umbilical region and the diffuse infiltration of gastric parietal mesenteric fat. Histology of the ovarian mass confirmed Krükenberg's tumor and that of the Sister Marie-Joseph's nodule confirmed umbilical skin metastasis. The primary was a well differentiated gastric adenocarcinoma. The death occurred after the first chemotherapy treatment. The association of Krükenberg's tumor with Sister Marie-Joseph's nodule, rare and unusual, has been revealing of a gastric adenocarcinoma which up to now was unknown and asymptomatic.