The differential diagnosis of neuroendocrine neoplasms of the larynx is broad and includes lesions of epithelial, mesenchymal, and neuroectodermal origin. These lesions have overlapping clinical and pathologic aspects and must be carefully considered in the differential diagnosis of laryngeal neoplasms. The prognosis and treatment are also different among these tumor types, which necessitates making these distinctions clinically. The current literature was reviewed to provide updated information regarding the epithelial-derived tumors, including carcinoid, atypical carcinoid, small cell neuroendocrine carcinomas, large cell neuroendocrine carcinoma, and squamous cell carcinoma with neuroendocrine component. These tumors are compared and contrasted with non-epithelial-derived tumors such as paraganglioma and nonmucosal tumors, such as medullary thyroid carcinoma. The morphologic and cytologic features are discussed, along with helpful immunohistochemical and ancillary investigations.

*Department of Pathology University of Arkansas for Medical Sciences Little Rock AR ‡Department of Biomedical Sciences and Medicine University of Algarve Faro Portugal †International Head and Neck Scientific Group Padua §ENT Service University of Udine School of Medicine Udine Italy ∥Department of Pathology Faculty of Medicine in Plzen Charles University Prague Plzen Czech Republic ¶Department of Pathology Radboud University Medical Center Nijmegen Department of Pathology UMC Utrecht Utrecht The Netherlands **Department of Anatomic Pathology Hospital Clinic University of Barcelona Barcelona Spain

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Role of ancillary techniques in profiling unclassified laryngeal malignancies