Extensive cutaneous metastatic breast carcinoma of the hand and upper extremity: a case report.

Cutaneous metastatic breast carcinoma involving the hand is extremely rare. We report a case of a 39-year-old woman with a history of recurrent invasive ductal adenocarcinoma of the breast who had a right modified radical mastectomy, chemotherapy, and radiation therapy before presenting to our institution with extensive cutaneous metastasis to the upper limb including the hand. The presentation, pathogenesis, incidence, prognosis, management, and differential diagnosis of cutaneous metastatic breast carcinoma to the hand and upper limb are discussed.