title: Primary carcinoid tumor of the kidney: a light and electron microscopic, and immunohistochemical study.
abstract: We report a case of primary carcinoid of the kidney. The neoplasm had a trabecular growth pattern and was argyrophil positive and argentaffin negative. An extensive battery of immunohistochemical stains was negative for specific peptide products and keratin. Electron microscopy disclosed numerous cytoplasmic membrane-bound electron-dense core secretory granules and masses of intermediate microfilaments. A review of the pertinent medical literature revealed 5 previously reported cases.
mesh_terms: D000328:Adult; D002276:Carcinoid Tumor / Q000032:analysis / Q000648:ultrastructure*; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D003599:Cytoskeleton / Q000648:ultrastructure; D006801:Humans; D007633:Keratins / Q000032:analysis; D007680:Kidney Neoplasms / Q000032:analysis / Q000648:ultrastructure*; D008297:Male; D008854:Microscopy, Electron; D013194:Staining and Labeling
chemical_list: D007633:Keratins