Abstract
In some cases, schwannomas may be clinically indistinguishable from other subcutaneous tumors, including epidermal cysts and lipomas. In such cases, high-resolution ultrasonography is often helpful for diagnosis. Schwannoma is usually a well-defined, homogeneous, hypoechoic mass that shows posterior acoustic enhancement on sonography. On color Doppler imaging, increased blood flow is reported in schwannomas. We report some experiences of schwannomas in which arterial flow in the lesion was depicted on spectral Doppler sonography. This is specific to schwannomas, because benign subcutaneous tumors other than vascular tumors rarely have intralesional arterial flow. In conclusion, spectral analysis aids the diagnosis of subcutaneous tumors.
