• Qiushi Bai, Xiongfei Zou, Gang Yang, Yu Fan, Wenze Wang, Baozhong Zhang, and Xiao Chang.
• Department of Orthopaedics, Peking Union Medical College Hospital, Beijing, China.
• Medicine (Baltimore). 2023 Apr 25; 102 (17): e33694e33694.

RationaleMyositis ossificans circumscripta (MOC) is a rare disorder that causes heterotopic bone formation in soft tissues. It usually occurs after trauma and affects large muscles of the extremities. MOC of the pectineus muscle is extremely rare and has not been reported to be treated surgically.Patient ConcernsA 52-year-old woman presented with left hip pain and dysfunction 4 months after a traffic accident that caused pelvic and humeral fractures and cerebral hemorrhage.DiagnosesRadiological imaging revealed isolated ossification of the left pectineus muscle. The patient was diagnosed with MOC.InterventionsThe patient underwent surgical resection of the ossified pectineus muscle followed by local radiation and medical therapy.OutcomesAt 12 months postoperatively, she was asymptomatic and had normal hip function. No recurrence was observed on radiography.LessonsMOC of the pectineus muscle is a rare condition that can cause severe hip dysfunction. Surgical resection combined with radiation and anti-inflammatory drugs can be an effective treatment option for patients who do not respond to conservative management.Copyright © 2023 the Author(s). Published by Wolters Kluwer Health, Inc.

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