Fine-needle aspiration is insufficient for the diagnosis of chest wall tumors,and incisional biopsy is required for the accurate morphologic diagnosis of GCT.14,17,20,21 The immunohistochemical stains for vimentin, S100, pancytokeratin, desmins, and smooth muscle antigen can be useful in uncertain cases.11 The gene discussed is DES; the disease is granular cell tumor.