Ultrasound-guided Tru-cut needle biopsy of the left periprosthetic mass documented morphologic and immunohistochemical features (CD30 + , ALK-, CD3-, CD5-, PAX5-, LMP1, cytokeratin AE1/AE3-, S100-) compatible with a BIA-ALCL (Fig. 3). Here, TNFRSF8 is linked to anaplastic large cell lymphoma.