Intraosseous Ganglion of Both Patellae: A Case Report

ABSTRACT

An intraosseous ganglion cyst, of which pathogenesis is unclear, is grossly and histologically identical to soft tissue ganglion. It predominates in the subchondral regions of tubular bones and is an osteolytic lesion that is well demarcated, radiographically. Pathologically, it is composed of a multilocular, thick, fibrous walled cyst-like structure filled with a slimy, mucin rich fluid. Curettage or curettage with bone graft is usually curative. Authors experienced a case diagnosed as intraosseous ganglia of both patellae. A 37-year-old man complained of both knee joint pains for about 4 month. About 1 year ago prior to this visit, he was treated one time because of the anterior knee pain. In the following X-rays, a well-defined osteolytic lesion involving the subchondral area of both patellae was showed. After CT and bone scan-ning, excision biopsy with curettage was performed. The thick, jelly-like mucinous fluid oozed out. His-tological findings were consistent with an intraosseous ganglion cyst. At 8 months follow-up, pain was completely resolved and other abnormal findings were not observed clinically.