[Primary lung paraganglioma. A case report]

Primary lung paragangliomas are rare. They are 1-2% of the paragangliomas, and most of them occur in patients of 43-61 years. They clinically appear as solitary tumors and are in general asymptomatic. These tumors show a nesting pattern (Zellballen) of chief polygonal cells locked by fibrovascular trabeculae with subtenticular cells. The main cells have uniform nuclei with granular eosinophilic cytoplasm, and they are positive for neuroendocrinal markers (Neuron Specific Enolase, sinaptofisine and cromogranine A). Sustentacular cells are positive for protein S-100 and neurofibrilar protein. A differential diagnosis with the carcinoid tumor can be very difficult. The surgical treatment is mandatory , specially high blood pressure and the chances of malignization.

[Small intestinal plasmacytoid lymphoma. Clinical presentation with acute abdominal pain]

Primary tumors of the small intestine are rare; 15-20% of the cases are extranodal lymphomas from B or T cells. Higher Incidence occurs in patients between 21 and 50 years. The clinical symptoms are pain, intestinal obstruction, diarrhea, bleeding or perforated peritonitis. In high-grade lymphomas, the cells are large and pleomorphic, with immunoblastic and plasmacytoid features, and immunopositive for alpha chain immunoglobulins. We reported the case of a 56-year-old patient presented with abdominal pain associated with intestinal perforation. Resections of a 9-centimetres-long segment in the small intestine was performed, which was covered by purulent plaques, with a perforation of 5 mm, surrounded by a greyish-white thick intestinal wall. It can be observed in the microscopy a proliferation of neoplastic cells arranged diffusely and with frequent mitosis. Large areas of immunoblastic and plasmacytoid configuration were evident. The immunomarcation was consistent with a lymphoma of large cells, immunophenotype B, with plasmacytoid development. We highlighted the clinical presentation like acute abdominal pain and its clinical and pathological characteristics, especially in the plasmacytoid development that should differ of the true plasmocytoma.

[Hight resoluton optical microscopy of the cellular cycle in psoriasis patients]

Skin tissue from patients with Psoriasis was analyzed using HROM (High Resolution Optical Microscopy), studying epithelial differentiation and possible structural alterations of the queratinocytes. The samples were taken from 10 patients with histopathologic diagnosis of Psoriasis. This tissue samples where affixed with glutaraldehide buffer-collidine for 48 hours. Later processed with the HROM technique and colored with toluidine blue, metilene blue, basic Fuscine, and silver metenamine. The basal epithelial elements presented ovoid nucleus and most of them had prominent nucleolus. In 7 of the studied cases, the granulose stratus was absent, and thinner in the rest, with nucleus and nucleolus retention. At this level queratinocytes where observed with perinuclear anfofilia, as well as linfocitic and macrophagic infiltrate and union complex where elongated.

[Heterotopic mesenteric ossification. Description of a case]

We describe a case of heterotopic mesenteric ossification presented in a 25 year-old male who underwent laparotomy for a fire-gun injury. Two weeks later he experienced small bowel obstruction and for this reason he has been operated five times with removal of segments of small bowel. Now, nine months later, he needs ileostomy to avoid another obstruction.

Fibromatosis mimicking clinically invasive breast carcinoma

Our purpose is to report two cases of fibromatosis in two women of 34 and 48 years old respectively that clinically appeared as a invasive breast carcinoma, particularly for the cutaneous retraction they showed. The histopathological diagnosis was done based on specimens studied with the common technique of paraffin embedding and Hematoxilin & Eosin staining. Both patients had firm poorly demarcated nodules with the histopathological pattern of classic fibromatosis. Mammary fibromatosis is an infrequent relapsing entity, not suspected in differential clinical diagnoses. The pathologist should bear it in mind, especially in frozen biopsies.