An isolated ileal perforation is presented in a 12-yr-old patient. Mic
roscopic examination revealed granulomatous inflammation due to Entero
bius vermicularis (pinworm). This is only the third documented report
of intestinal perforation involving pinworms. Although infestation wit
h this parasite is generally considered to be relatively harmless, on
rare occasions, it can be a significant cause of morbidity due to its
potential ability to invade the tissues.