Intraosseous Ganglion Cyst of Olecranon

Intraosseous ganglia are benign cysts that usually can be seen inlower extremity; especially around ankle.these cysts have fewerincidences in upper extremity, mainly around the wrist. they areextremely rare in olecranon. these lesions are often asymptomatic.patient was a 75-year-old man who had trauma many years ago.when he came to our clinic, he complained of severe painaround his elbow that he could not do ordinary activity. he hadlocal tenderness in elbow and 30 degree limitation in extension.in radiography, lytic, multiloculated lesion existed in region ofolecranon. after excisional biopsy was done, cavity was cleanedcompletely with curette and was filled with autogenous bone.at 10-year follow-up, the patient was completely asymptomatic.control radiograph showed cavity filled completely by bone; therewas no evidence of relapse.