title: [Signet ring cell carcinoid of the appendix. Morphological, histochemical and immunohistochemical study of a case].
abstract: A case of carcinoid tumor of the appendix with "signet ring" cells pattern and asymptomatic clinical course is presented. The tumor was detected during a Bilroth I gastrectomy procedure. Mucin-secreting cells with cytoplasms often containing argentaffin and argyrophil granules was the predominant histologic pattern. Lack of neuron-specific enolase activity and their positivity for lysozyme and EMA marker indicate an origin from crypt cell and not a neural crest source. After simple appendectomy, the patient was healthy 3 years following surgery.
mesh_terms: D002288:Adenocarcinoma, Mucinous / Q000473:pathology*; D001063:Appendiceal Neoplasms / Q000473:pathology*; D001065:Appendix / Q000473:pathology*; D002276:Carcinoid Tumor / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged
vernacular_title: Carcinoide apendicular de células en "anillo de sello". Estudio morfológico, histoquímico e inmunohistoquímico de un caso.