A 58-year-old female with left primary neuroendocrine carcinoma of the breast. Findings: (A) axial T1 precontrast image, (B) axial inversion recovery precontrast image, and (C and D) axial T1 postcontrast subtracted images of both breasts demonstrate 2 confluent spiculated masses (arrows show better) isointense on T1, heterogeneous on T2, enhance with rapid wash-in and delayed washout enhancement located in the left lower inner quadrant, in the area of suspicious mammographic and ultrasound findings. There is a biopsy clip adjacent to the most posterior mass. There are several associated adjacent small enhancing satellite lesions. The entire area of abnormality on breast MRI measures approximately 5.5 × 3.5 × 2.5 cm. Technique: breast magnetic resonance images obtained in a 3.0 Tesla magnet using a dedicated breast coil. (A) Axial MRI T1 precontrast image, TR 4.728 TE 2.292 1 mm slice thickness. (B) Axial MRI T2 stir inversion recovery precontrast image TR 5475 TE 66.816, 4 mm slice thickness. (C) Axial MRI T1 postcontrast subtracted image 1 minute, TR 6.429 TE 2.556, 2 mm slice thickness, 18-mL Prohance. (D) Axial MRI T1 postcontrast subtracted image (5 minutes), TR 6.429 TE 2.556, 2 mm slice thickness, 18 ml Prohance. MRI, magnetic resonance imaging.