It is closely related to other neuroendocrine carcinomas of the lung, including carcinoid, atypical carcinoid, and large cell neuroendocrine carcinoma.
Misdiagnosisrate of pathologicalbiopsy was53 3% (8/15)including6casesmisdiagnosed as poordifferentiatedadenocarcinoma, one as leiomyosarcoma and 1as carcinoid.
Carcinoid tumors occur most commonly in your gastrointestinal tract, including your stomach, small intestine, appendix, colon and rectum, or in your lungs.