Abstract
Baker cyst is an abnormal enlargement of the gastrocnemius-semimembranous bursa behind
the knee joint due to an exit of joint fluid.
We herein report a rare case of giant Baker cyst in a rheumatic arthritic female patient.
An MRI scan showed a complex, multiloculated cyst measuring 11.8 cm x 4.6 c, x 3.3 cm,
arising from the left knee joint. Open surgical excision of the lesion was performed,
and no recurrence was observed during the one-year follow up in the Rheumatology and
Orthopedics Department.
A natural tendency towards intermuscular extension is observed; thus, intramuscular
extensions are rarely reported in the literature. To the best of our knowledge, no
Baker cyst of such size has been operated in a rheumatoid arthritis patient.
Keywords
cyst - gastrocnemius muscle - osteoarthritis, knee - synovial membrane
