PMEL and uterine corpus leiomyoma: Of note, rare incidences of uterine leiomyoma with scant positive staining for HMB45 have been reported.15, –17 However, we speculate these reports may represent typical staining patterns of lesions of pericyte lineage such as the monotypic (fat-poor) variant of angiomyolipoma, another rare mimicker of leiomyoma occurring in the uterus.18