Fig. 1

a The mammogram revealed that the implant was displaced anteriorly and inferiorly by a large, lobular, ill defined, soft tissue density mass (white arrow). The implant appears intact but compressed. b Ultrasound revealed a peri-implant effusion (white arrow), with the implant displaced and compressed by a large lobular solid heterogeneous mass (red arrow). Masses, as in this case, are unusual in breast implant-associated anaplastic large cell lymphoma (BIA-ALCL). The diagnosis was confirmed by core biopsy of the mass. c Positron emission tomography/computed tomography (PET/CT) revealed a large mixed-density mass with intense FDG activity, deep within and invading the right breast and pectoralis muscles. There was metastatic disease spread to the lung and bone