Diagnosis of anaplastic large cell lymphoma on late peri-implant breast seroma: Management of cytological sample by an integrated approach.

INTRODUCTION: Peri-implant breast seroma is a late clinical presentation of reconstructive surgery or augmentation mammoplasty with breast implants. Pre-operative cytological evaluation of the peri-implant breast seroma is a common clinical approach, showing mainly an inflammatory reaction or more rarely a breast implant-associated anaplastic large cell lymphoma. Herein, we reported the role of cytology in the evaluation of peri-implant breast seroma and its critical pre-operative implications. METHODS: Eight cases of peri-implant breast seroma from files at Luigi Vanvitelli University were identified between January and December 2017. In all cases, seroma was aspirated; cytospins were performed and stained by Papanicolaou stain; finally, in all cases, a cell block was obtained for immunocytochemical evaluation and, in one case, for FISH to detect ALK1-gene translocation. RESULTS: The median age of patients was 48 years and the mean time between the implant placement and the occurrence of peri-implant breast seroma was 18 months. Microscopic examination showed breast implant-associated anaplastic large cell lymphoma in one case, aspecific inflammatory reaction in six cases and silicon-associated reaction in one case. CONCLUSIONS: Peri-implant breast seroma may be caused by several pathological conditions with different clinical behaviour. A proper cytological approach to peri-implant breast seroma allows a correct differential diagnosis between inflammatory conditions and breast implant-associated anaplastic large cell lymphoma and an appropriate management of the patient.