Fig. 4

Surveillance image. A 57-year-old woman underwent breast-conserving surgery (BCS) with acellular dermal matrix (ACM) in the left breast. The patient refused adjuvant chemotherapy and radiotherapy, and recurrence was detected after 6 months. (a) Mammography showing grouped amorphous and pleomorphic microcalcifications (white arrow) adjacent to the BCS scar. (b) Ultrasonography showing ill-defined heterogeneous hypoechoic parenchymal lesions with hyperechoic dots representing calcifications (white arrow) in the upper inner quadrant of the left breast. An ultrasound-guided core needle biopsy was performed. (c) A subtracted 2-min sequence of magnetic resonance imaging shows non-mass-like enhancement of the lesion (white arrow) adjacent to the ADM pocket (empty arrows). (d) Chest computed tomography shows a non-mass-like enhancement of the lesion (white arrow) adjacent to the ADM pocket (empty arrows)