We report a case of intramuscular myxoma occurring in the adductor brevis. A sixty-year-old man was referred to our hospital with a large soft tissue mass in the left thigh detected by abdominal CT. MR-imaging disclosed a large mass that was homogenous hypointense with respect to the adjacent muscle on T1-weighed image and hyperintense on T2-weighed image. The mass showed remarkable irregular postcontrast enhancement. We removed the tumor completely after the final diagnosis of intramuscular myxoma by open biopsy. Intramuscular myxomas are benign lesions both clinically and histologically, but may cause confusion in preoperative roentgenographic diagnosis if these are identified with unusual expression.
