title: Ruptured epidermal inclusion cyst of the palm presenting as collar-button abscess.
abstract: Two cases of epidermal inclusion cysts that ruptured as a result of trauma and then mimicked pyogenic collar-button abscesses are reported. Rupture of the cyst into the palmar subcutaneous tissue produced an inflammatory response that led to the sterile abscesses drained at surgery. Presentation of a deep space abscess without history of penetrating injury should suggest this diagnosis.
mesh_terms: D000038:Abscess / Q000209:etiology* / Q000601:surgery; D000293:Adolescent; D000328:Adult; D004814:Epidermal Cyst / Q000150:complications* / Q000601:surgery; D006230:Hand Injuries / Q000150:complications* / Q000601:surgery; D006801:Humans; D008297:Male; D012421:Rupture