Résumé : The granular cell rhabdomyoma, or myoblastoma, is commonly known as Abrikossoff's tumor. It is a rare benign tumor thought to originate from the Schwann cell, and can occur anywhere in the body. When occurring in the breast, the clinical and radiological signs can mimic a primary breast carcinoma. Our case involves a patient who presented via the routine breast screening program. The combination of mammography and sonography suggested a malignant lesion. An ultrasound-guided microbiopsy of the suspicious nodule gave the diagnosis of a rhabdomyoma, and this was confirmed by immunohistochemical studies. The definitive histopathology result confirmed an Abrikossoff tumor, which was completely excised with clear margins of healthy breast tissue. The microbiopsy and immunohistochemical studies allowed the diagnosis to be confirmed and avoided any unnecessary surgery. © 2007 Springer-Verlag.