Diagnostic problems of epithelial tumors of penis.

Malignant epithelial tumors of the penis often present aspects which make difficult an accurate clinical and pathologic diagnosis. Frequently, repeated biopsies yield a benign diagnosis while the tumor continues to progress and sections through it indicate malignant components. It is suggested that epithelial tumors of the penis may consist, in many instances from their start, of a mixture of benign and malignant elements in ratios varying from one extreme to the other. This may explain why biopsies are frequently misleading, yielding a benign result while, in fact, the tumor is malignant.