An unusual case of rapid-growing posttraumatic gluteal epidermal cyst
with ischiorectal and presacral extension is reported. Pertinent clini
cal history and magnetic resonance imaging allowed accurate preoperati
ve diagnosis. Cautious complete excision was important to prevent recu
rrence. To our knowledge, posttraumatic gluteal epidermal cyst with th
is unusual clinical presentation has not been described previously.