title: Thymus carcinoid.
abstract: A carcinoid of the thymus was studied by light- and electron-microscopy, immunohistology and flow-cytometry. The tumor showed a ribbon- and festoon-like growth-pattern with foci of necrosis, invasion of vessels and infiltration of mediastinal lymph nodes. The cytoplasma of the tumor-cells contained neuroendocrine granula and immunohistochemistry of ACTH was positive. The tumor-cells were connected by desmosomes, correlating to a pre-keratin positive immunohistology. In flow-cytometry the tumor-cells showed a near haploid DNA aneuploidy which is an extremely rare finding in solid tumors and in the few cases described indicative for treatment resistance.
mesh_terms: D002276:Carcinoid Tumor / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery / Q000648:ultrastructure; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D008207:Lymphatic Metastasis; D008854:Microscopy, Electron; D008875:Middle Aged; D009336:Necrosis; D013964:Thyroid Neoplasms / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery / Q000648:ultrastructure