Figure 3: Microscopic growth patterns in human papillomavirus-associated (HPVA) squamous cell carcinomas (SCCs):
keratinizing (A); non-keratinizing (B); basaloid (C); papillary (D); inverted papillary (papillae invading the storm without an exophytic component) (E, F); warty (G); lymphoepithelioma-like (H); microscopic growth pattern, p16 is block-type positive (I).