Trichoblastoma of the Breast Detected by Screening Mammography: A Diagnostic Pitfall

The document reported on two cases of trichoblastoma, a benign skin tumor, detected in the breast through mammography, which initially led to diagnostic confusion with malignancy. In both cases, the tumors were initially misdiagnosed as more serious conditions, such as basal cell carcinoma and invasive ductal adenocarcinoma, but were later correctly identified as trichoblastoma through excision and dermatopathologic review. The study highlighted the diagnostic challenges due to histological similarities with other tumors and emphasized the importance of dermatologic expertise and immunohistochemistry in accurate diagnosis. Key diagnostic features included the presence of papillary mesenchymal bodies and reactive Merkel cells. The study recommended considering skin adnexal tumors during breast screenings and consulting expert dermatopathologists to avoid misdiagnosis.