Fine needle aspiration cytology of invasive micropapillary (pseudopapillary) carcinoma of the breast. Report of 11 cases with clinicopathologic findings.

OBJECTIVE: To describe the cytologic features of invasive micropapillary carcinoma of the breast, a distinct, unusual variant of infiltrating duct carcinoma characterized histologically by pseudopapillary structures lacking fibrovascular cores and tubuloalveolar structures floating freely within clear spaces separated by a delicate fibrocollagenous stroma and characterized clinically by prominent lymphotropism and an aggressive clinical course. STUDY DESIGN: We reviewed the clinical, cytologic, histologic, immunohistochemical and flow cytometric features in 11 cases of invasive micropapillary carcinoma of the breast diagnosed preoperatively by fine needle aspiration. RESULTS: All patients were women, ranging in age from 31 to 83 years. A preoperative diagnosis of malignancy was made in all cases. Tumor size ranged from 1.2 to 5.5 cm. Ten patients had lymph node metastases. Cytology was characterized by a "dual" pattern formed by round or angulated, three-dimensional, cohesive clusters of neoplastic cells with pseudopapillary configuration and two-dimensional, dyscohesive aggregates and single cells with high grade nuclei and intact cytoplasm.

Acinic cell adenocarcinoma of the parotid gland: case-report.

We report a case of acinic cell adenocarcinoma of the parotid in a 18-year-old young man. Clinical examination showed a firm mobile mass of the gland. Light microscopy revealed the tumor composed of two distinct cell populations: a main one with large, polyhedrical or round cells with eosinophilic cytoplasm and a smaller proportion of granular cytoplasm clear cells. These tumor cells were periodic acid Schiff reaction (PAS) and mucicarmine staining negative. Immunohistochemically tumor main cells exhibited diffuse positive reactivity for cytokeratin and focal for S-100 protein. Both reactions were negative in smaller cell population. Was formulated a diagnosis of "non-specific glandular cell-type of acinic cell adenocarcinoma.