To investigate the diagnosis and differential diagnosis value of the high-frequency ultrasound superficial schwannoma.

Sonograms of superficial schwannoma in 97 cases from January 2011 to January 2017 in Changzhou 2nd People′s Hospital were analyzed. The ultrasonic manifestations of 97 cases are collected, such as position, quantity, size, shape, internal and periphery echo, boundary, envelope, rear echo. The surveyed mass blood flow information in 97 cases is surveyed by color doppler flow imaging.

The ultrasonic manifestations of 97 cases(53 cases located in limbs, 19 cases located in cervical part, 25 cases located in other positions of body surface) specifically as follows. 1. Lump quantity: 97.9% cases were olitary(95/97). 2. Lump envelope: completed or relative completed envelope echo and sharpness of border were found in all cases(100%, 97/97). 3. Lump internal echo: Well-distributed or dis-well-distributed low level echo was found in 71 cases (73.2%, 71/97), anechoic areas of variable size were found in 26 cases (26.8%, 26/97), honeycombing structure were found in 12 cases, cyst were found in 3 cases. 4. "Mouse-tail-sign" : "Mouse-tail-sign" in uni-tip or/and amphi-tip in 71 cases. 5. To observe the mass internal and periphery blood flow with color dopper flow imaging(CDFI): Mass internal and periphery were found blood flow signal in 71 cases(73.2%, 71/97). Disdiagnosis and indefinite diagnosis information: four cases located in cervical part were misdiagnosed as swelling lymph nodes, two cases located in cervical part were misdiagnosed as tumor of carotid body, three cases located in four limbs were misdiagnosed as neurofibroma, three cases were misdiagnosed as popliteal fossa region cyst in popliteal fossa region, two cases located in lower limbs were misdiagnosed as fibroma. Ultrasonic physical diagnosis were issued in 12 cases only, failed to cue schwannoma. Among 72 cases in cervix and limbs, the ultrasonic diagnosis were according with pathological diagnosis of 12/19 (84.9%) cases in cervix and 45/53 (63.2%) cases in limbs. The difference between cervix and limb groups are statistically significant (χ²=4.01, P<0.05).

Most of body superficial schwannoma ultrasonogram have some characteristics, high-frequency ultrasound has high diagnostic accurate rate. The four limbs part has higher accurate rate than cervical part. When the ultrasonogram lacking marking manifest, medical history, clinical situation and other iconography check should be combined in avoiding of misdiagnosis.