We correlate findings from magnetic resonance (MR) imaging and pathology in a 55-year-old woman with spindle cell carcinoma of the breast. Pathological examination showed a fibrous capsule at the margins and abundant fibromyxoid stroma within the mass. Spindle cell carcinoma may be included in the differential diagnosis of expanding round masses with internal components that demonstrate rapid initial enhancement with high signal intensity on T(2)-weighted images in postmenopausal women.
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