rhabdomyosarcoma metastasis to the breast: appearance on diffusion-weighted imaging and apparent diffusion coefficient sequences

rhabdomyosarcoma is a common primary childhood malignancy that rarely metastasizes to the breast. we report a patient with a primary sinonasal rhabdomyosarcoma metastasizing to the breast, with no distant spread. we describe the imaging appearance of rhabdomyosarcoma on magnetic resonance imaging (mri), particularly on diffusion-weighted imaging (dwi) and apparent diffusion coefficient (adc) sequences. rhabdomyosarcoma metastasis has a variable appearance on ultrasound and mri, and may mimic common benign tumors. however, it appears hyperintense on dwi and produces a low value on the adc, which may be more accurate for determining its malignant nature.