Muscular involvement of extranodal natural killer/T cell lymphoma misdiagnosed as polymyositis: A case report and review of literature

Figure 1 Positron emission tomography/computed tomography scans. A positron emission tomography/computed tomography scan showing multiple intensely fluorodeoxyglucose -avid muscle lesions scattered throughout the body (SUVmax of 8.9). A: The bilateral thigh (arrows); B: Both calves (arrows); C: The right pectoralis major (arrows); D: Fluorodeoxyglucose-avid lesions in the oropharynx (arrows, SUVmax of 6.3).

Figure 2 Immunohistochemical staining. A and B: Histological findings of the pharyngeal wall (hematoxylin-eosin: panel A, × 200; panel B, × 400), showing diffuse infiltration with atypical lymphoid cells; C: Immunohistochemical staining for CD56 was negative (× 200); D-F: Immunohistochemical staining was positive for TIA-1 (panel D, ×200), CD30 (panel E, × 200) and EBER (panel F, × 200).

Figure 3 Calf circumference before and after chemotherapy treatment. A and B: The left calf circumference was 52.5 cm and 32.7 cm, respectively, before and after chemotherapy treatment; C and D: The right calf circumference was 46.8 cm and 29.2 cm, respectively, before and after chemotherapy treatment.