Objective This study investigated the sonographic features of extramammary myofibroblastomat (MFB). Methods The ultrasonographic findings of 7 patients of MFB confirmed by pathology were retrospectively analyzed.Results All the 7 patients showed a single mass. There were 5 males and 2 females. The age of 7 patients ranged from 6 to 68 years old. Average maximum diameter was 50.86±15.56mm, 5 of the tumors located at the subcutaneous layer of the inguinal region，2 located at the pelvic cavity, which was close to the bladder and iliac vessels. The tumors were located on the left side of the body in 5 cases and on the right side in 2 cases. The gray-scale ultrasonography of all the masses showed circumscribed margin, irregular shape, heterogenous hypoechoic mass. The degree of hypoechoic echo is lower in the inguinal region than in the pelvic cavity. Only 1 case of microcalcification was found in the inguinal region. The pelvic mass was larger. CDFI showed that blood flow signals of all inguinal masses were dotted and linear. There was no obvious blood flow signal in the pelvic mass. No recurrence or metastasis occurred in all patients. Conclusion MFB mostly occurs in middle-aged and elderly male patients. Ultrasound manifestations of MFB in superficial soft tissue are single, circumscribed margin, irregular and heterogenous hypoechoic mass, and blood flow signals were dotted and linear. In addition to the larger volume and no obvious blood flow, there was no significant difference in the ultrasonographic features between the superficial soft tissue and the cases of deep organs, there was no recurrence or metastasis in the two types. Preoperative diagnosis is sometimes difficult, and pathological biopsy is still needed to confirm the diagnosis when it is necessary.