Primary oat cell carcinoma of the larynx: an ultrastructural study

An extrapulmonary oat cell carcinoma arising in the larynx is described. Ultrastructurally the tumor is identical to the oat cell carcinoma of pulmonary origin. The pressure of neurosecretory granules in our case strongly suggests that the tumor is derived from Kulchitsky-like cells, a histogenesis previously proposed for oat cell carcinoma of the lung.