An Aggressive Digital Papillary Adenocarcinoma and a Grossly Similar, Contralateral Callus: A Case Report.

CASE: This is a case of a 44-year-old man with 10 years of history of painful callus-like swellings of bilateral index fingers. Sudden enlargement of the left index finger prompted biopsy, which revealed aggressive digital papillary adenocarcinoma (ADPA) that was treated with partial amputation. Biopsy of the contralateral finger revealed acanthotic skin with no evidence of malignancy. CONCLUSION: Several case reports cite antecedent insult and chronic swelling before diagnosis. We describe a case of bilateral lesions with similar gross appearances, a long history of occupational repetitive trauma, and sudden enlargement of 1 lesion leading to the diagnosis of ADPA.