The granular cell tumor of the breast is an uncommon, usually benign tumor which is possibly of neural origin.

On mammography, these tumors can present as an ill-defined or speculated lesions, similar to breast carcinoma.

On ultrasound, this tumor mostly appears as a solid, hypoechoic, ill-defined mass, associated with a posterior shadowing, or as a well-circumscribed oval mass, associated with a posterior enhancement, depending on the extent of infiltration and degree of reactive fibrosis.