Abstract
We report the case of a 61-year-old female. A tumor was observed in her right knee following an injury sustained by a fall one year earlier, and she underwent a puncture at a clinic after being diagnosed with ganglion. The subject was referred to us when a fistula discharging jelly-like liquid subsequently formed at the puncture site. There was no redness, swelling, or limited range of motion in her right knee upon examination, and the McMurray test was negative. On observation, the fistula exuded a jelly-like liquid. The infrapatellaris exhibited a low signal on T1-weighted imaging, and a high signal multilocular tumor shadow was observed on fat-suppressed T2-weighted imaging. An infrapatellar ganglion in the right knee was diagnosed based on magnetic resonance imaging (MRI) findings and it was subsequently excised surgically. A definitive diagnosis of infrapatellar ganglion was made on the basis of the results of histopathological examination. The patient's symptoms disappeared after resection and no recurrence was observed on MRI.
