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Click 43 year old female with a hard, firm nodule at the confluence of the external quadrants of the left breast diagnosed as a breast pilomatrixoma after percutaneous and excisional biopsy. FINDINGS: hypoechogenic nodule (13x14x10 mm) showing irregular margins, hyperechoic spots due to microcalcifications and posterior acoustic shadowing (1;2;3). Color Doppler analysis showing no internal vascularization of the nodule (4;5). TECHNIQUE: ultrasound examination using a broadband 10-13 MHz linear transducer.