title: Carcinoid tumors. Changing concepts and new perspectives.
mesh_terms: D002276:Carcinoid Tumor / Q000175:diagnosis / Q000378:metabolism / Q000473:pathology*; D003581:Cytodiagnosis; D003937:Diagnosis, Differential; D006801:Humans; D007158:Immunologic Techniques; D008854:Microscopy, Electron