Intraosseous Epidermal Cyst of the Distal Phalanx: A Case Report

Epidermal cysts are common benign tumors of the skin, but intraosseous epidermal cysts at the phalanx are rare. Congenital anomalies, trauma, and iatrogenic factors are reported as etiological causes. Phalangeal epidermal cysts commonly involve the distal phalanx. Epidermal cysts occur at periosteal soft tissue and invade the bone, resulting in circular or discoid bony destruction. Treatment involves a combination of curettage and bone grafting, and it has a good prognosis, with a low recurrence rate. 1) Intraosseous epidermal cysts are too rare to be of primary concern. However, it is important to rule out other more common diseases of the distal phalanx that present with similar clinical manifestations and radiological findings.