PMC9845545_01
A: Surface appearance of cardiovascular implantable electronic device (CIED) pocket swelling. B, C: Computed tomography scan of the chest in coronal (B) and axial views (C) showing a soft mixed-density material surrounding the left anterior chest wall CIED. D: Pathology with hematoxylin-eosin staining showing partially necrotic tumor with diffuse proliferation of atypical cells with frequent mitotic figures and apoptosis extending into skeletal muscle.
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Flow cytometry revealed evidence of abnormal B cells, confirming the diagnosis of diffuse large B-cell lymphoma, activated immunophenotype (Figure 1).