Fig. 2. Pathologic findings (H&E, ×10). (A) Light microscopy reveals a lesion primarily composed of foamy histiocytes, accompanied by a notable presence of lymphoplasmacytic cells. (B) Infiltration of adjacent skeletal muscle bundles (circled) by these cellular components is evident. (C) Additionally, focal areas of abscess formation and fibrinoid necrosis (arrowheads) are observed within the area.
