Cytology of the solitary papilloma of the bronchus.

The cytologic and histologic findings in a case of solitary squamous cell papilloma of the bronchus are reported. The cytologic features of this rare bronchial tumor included regular squamous cells, round basal cells with no atypsim and nuclear irregularity. Although these findings suggest a benign, rather than a malignant tumor, the definite nature of the tumor was established only on histologic examination of the entire surgically resected specimen.