Benign

Malignant

Epithelial

Squamous cell papilloma

Squamous cell carcinoma

Adenoma

Basaloid carcinoma

Spindle cell carcinoma

Adenocarcinoma

Adenosquamous carcinoma

Mucoepidermoid carcinoma

Adenoid cystic carcinoma

Endocrine tumors (carcinoid tumor, small cell carcinoma, and endocrine cell carcinoma)

Undiffrentiated carcinoma

Non-epithelial

Leiomyoma

Leiomyosarcoma

Rhabdomyoma

Rhabdomyosarcoma

Neurogenic tumor (Schwannoma, neurofibroma, and granular cell tumor)

Gastrointestinal stromal tumor (GIST)

Hemangioma

Malignant lymphoma

Lymphangioma

Malignant melanoma

Lipoma

Mixed

Carcinosarcoma