Article Title: Characteristic Appearances of Peripheral Schwannoma on High-Resolution Ultrasonography And MRI: Comparison Between Antoni A-Dominant and Antoni B-Dominant Types
Author: Kazumi Fujioka
Published Date: November 30, 2020
Schwannomas or neurilemmomas are the most common tumors of the peripheral nerves. In this article, the characteristic appearances of schwannoma on high-resolution ultrasonography (US) and magnetic resonance imaging (MRI) were currently reviewed. The author previously mentioned that schwannomas were painful and vascularized superficial tumors of the acronym “ENGLAND” or ”LEND AN EGG”. From a current knowledge, the distinction between Antoni A-dominant and Antoni B-dominant types was suggested on high-resolution US. Antoni A-dominant schwannomas may tend to be a small size on gray-scale US and moderate vascular flow on color Doppler US. While, it is putative that the Antoni B-dominant schwannomas may represent relatively large tumor associated with anechoic lesion reflecting necrosis and/or hemorrhage on gray-scale US and a few vascularity on color Doppler US. It is strongly suggested that when target sign was recognized on MRI, the lesion may be an origin from nerve sheath and benign type.