Follicular dendritic cell sarcoma/tumor: 2 cases of a rare tumor of difficult clinical and pathological diagnosis.

The follicular dendritic cell sarcoma/tumor is a neoplasic proliferation of fusiform and ovoid cells with characteristic morphology and immunohistochemical pattern. The sarcoma/tumor term is designated due to the variability of the cytological status and, in many cases, its indeterminate clinical course. This report presents the 2 first cases seen at the Hospital General de México, OD (General Hospital of Mexico).

Primary lymphomas of the breast: a report on 5 cases studied in a period of 5 years at the Hospital General de México.

Breast lymphomas can be primary or secondary. Among the primary lymphomas, the most common histologic types are the large B-cell diffuse lymphomas and the extranodal B mucosa-associated lymphatic tissue lymphomas. We studied 5 cases of primary breast lymphoma in female patients.

Mediastinal pleomorphic liposarcoma diagnosed by fine needle aspiration biopsy: a case report.

Background: Progress in radiology and pathology for diagnosing mediastinal tumors has R been made in recent decades, thanks to the use of fine needle aspiration biopsy (FNAB) guided by computed tomography, which has replaced mediastinoscopy and open biopsies.

Case: A 66-year-old male had a history o productive coughing with mucopurulent expectoration, progressive dyspnea, arthralgias, myalgias, astenia and adynamia for the previous 3 months. A CT scan and magnetic resonance imaging revealed a poorly limited tumor mass ofheterogeneous den sity in the anterior mediastinum.

Diagnosis of thymolipoma with fine needle aspiration biopsy. Report of a case initially misdiagnosed as liposarcoma.

Background: Thymolipomas are the most outstanding mesenchymal mediastinal tumors although they represent only a small percentage of thymic neoplasms. Their histogenesis remains unsolved, and they are usually benign. Fine needle aspiration biopsy (FNAB) has become the method of choice for the study of mediastinal tumors, including thymolipomas.