penile verrucous carcinoma

Differential diagnosis : verrucous anomalies / verrucous lesions

 giant condyloma : conspicuous koilocytosis, prominent fibrovascular cores
 hybrid verrucous carcinoma : foci of usual squamous cell carcinoma intermingled with a typical verrucous carcinoma
 papillary carcinoma : invasive and jagged border, more atypia, irregular but usually evident fibrovascular cores
 squamous hyperplasia : no atypia, no stromal reaction and no extension beyond lamina propria (in some cases distinction is not possible)
 warty carcinoma : koilocytotic change present, jagged tumor front, neoplastic cells with more pleomorphism, prominent fibrovascular cores and usually deeper invasion