Fig. 2: Pilar metaplasia, index patient #2.
From: Prostatic metaplasia and pilar differentiation in gender-affirming mastectomy specimens
A Single hair shaft in a duct with squamous metaplasia and periductal chronic inflammation. B Another isolated intraductal hair shaft. C Multiple hair shafts distending lumen of the duct. Changes at the lower-left portion of the duct resembling prostatic metaplasia. D Another example of multiple hair shafts within a distended duct lumen with a single multinucleate giant cell. E High power of the duct with multiple hair shafts; ductal epithelial cells showing squamoid features, resembling matrix differentiation. F Fontana-Masson stain, delineating melanin in hair shafts.
