Fig. 1

Key imaging and pathology results from the Rhabdomyosarcoma and Diffuse large B-cell lymphoma. a Axial view of the left thigh rhabdomyosarcoma demonstrating the lesion was FDG-avid on PET scan. b Morphology of rhabdomyosarcoma showing spindle cells in intersecting fascicles. (H&E, 200x) c Immunohistochemical stain for Desmin showing diffuse positivity supporting the diagnosis of rhabdomyosarcoma. d Axial view of the mediastinal diffuse large B-cell lymphoma demonstrating FDG-avidity on PET scan. e Morphology of lymph node showing involvement by diffuse large B-cell lymphoma. (H&E, 200x) f Higher power image of the lymphoma showing large lymphoid cells in sheets. (H&E, 400x)