Case 52, seborrheic keratosis. Case 52 was a seborrheic keratosis. One study pathologist diagnosed actinic keratosis citing the mild atypia in the epithelium. Consensus was that the correct diagnosis was seborrheic keratosis. The atypia may have been secondary to human papilloma virus (HPV). Figure 5 shows a lower power view of a tissue section.
Gilbertson et al. BMC Clinical Pathology 2006 6:4 doi:10.1186/1472-6890-6-4