Fibroadenoma masquerading carcinoma on fine-needle aspiration of the breast.

Objective: Benign and malignant lesions of the breast may have similar appearances on fine-needle aspiration cytology. We report a case of fibroadenoma that was diagnosed as carcinoma by cytology.

Case Study: Breast fine-needle aspiration biopsy was highly cellular and composed of bland-appearing spindle/columnar cells that could represent either epithelial or stromal cells; the case was reported as positive and the patient had subsequent excisional biopsy taken.

CD30 (Ber-H2) expression by thymocytes and thymic epithelial cells during the late first and second trimester of gestation: an immunohistochemical and in situ hybridization (ISH) study.

Background: The exact biological function of CD30 in the thymus during development has been only partially elucidated, although data indicate it may be involved in negative selection. This study was prompted by the observation of a positive reaction of thymic epithelial cells (TECs), Hassall's corpuscles, and thymocytes with the monoclonal antibody CD30 during the late first and second trimester.

Material/methods: Twenty paraffin-embedded fetal thymus specimens at the late first and second trimester were investigated by conventional histology and immunohistology for CD30 expression.

Primary MALT lymphomas of the stomach: a pathological study of 18 cases.

Aim: It is doubtful that whoever is suffering from gastric malt lymphoma will escape from the disease, if treated with medication against helicobacter pylori.

Material And Methods: A cohort of 18 patients was analysed. Ten hosts had primary gastric malt lymphoma and were treated with gastric resection as the initial therapy.

Loss of chromosome 1 in myxopapillary ependymoma suggests a region out of chromosome 22 as critical for tumour biology: a FISH analysis of four cases on touch imprint smears.

Objective: Ependymomas are glial tumours. They constitute approximately 5-10% of intracranial tumours and are tumours which can recur. Predictive factors of outcome in ependymomas are not well established.