[Objective]To investigate the clinical and MRI features of ganglion cysts around the flexor hallucis longus tendon.[Meth-ods]From December 2018 to December 2021,19 patients who suffered flexor longus tendon sheath cyst were retrospectively analyzed,in-cluding 12 males and 7 females,8 cases on the left side and 11 cases on the right side.All patients were examined by MRI,including sagittal T1WI,sagittal and coronal PDWI and transverse T2WI.The observation data were evaluated,involving the location and range of cyst,the sig-nal characteristics of the cyst and articular cartilage degeneration.[Results]Of the 19 patient,8(42.1％ )had the cyst found superior to the malleolar canal with longitudinal diameter from 4 to 8 cm,while 6(31.6％ )were distal to the malleolar canal with longitudinal diameter from 2 to 6 cm,and 5(26.3％ )had the cyst around the metatarsophalangeal joint with longitudinal diameter from 2.5 to 3.4 cm.In term of MRI characteristics,the cyst presents a smooth border mass around the joint,with low or moderate signal on T1WI,whereas high signal on T2WI and PDWI.In addition,15 of them got significant adjacent joint degeneration,including 11 of periarticular osteophytes,9 of subchondral os-teosclerosis,and 4 of metaphyseal bone marrow edema.Furthermore,13 patients had articular cartilage degeneration involving a total of 67 articular cartilage surfaces,according to the Recht criteria,5 articular cartilage surfaces of grade Ⅰ,18 of grade Ⅱ,and the rest articular carti-lage surfaces of grade Ⅲ or Ⅳ changes.[Conclusion]MRI could show the range,anatomic relationship and joint degeneration around the ganglion cysts,and provide help for clinical treatment.
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