CD‐34 and Ki‐67 staining patterns of basaloid follicular hamartoma are different from those in fibroepithelioma of Pinkus and other variants of basal cell carcinoma

Abstract

Basaloid follicular hamartoma shows a low proliferation index and an at least focally circumferential expression of CD-34 around the epithelial strands. This compares to the findings in trichoepithelioma. In contrast, fibroepithelial tumor of Pinkus and two other basal cell carcinoma subtypes display a high proliferative index and an absence of CD-34 expression around the epithelium. These findings support the non-neoplastic nature of basaloid follicular hamartoma.