Isolated Solitary Asymptomatic Skeletal Muscle Relapse of High-Grade Lymphoma Detected on Surveillance 18 F- Fluorodeoxyglucose Positron Emission Tomography-Computed Tomography.

While extranodal involvement of diffuse large B-cell lymphoma (DLBCL) is common, skeletal muscle involvement is extremely rare. Isolated skeletal muscle involvement in lymphoma is even rarer. We present here the case of a 26-year-old woman, who was diagnosed to have a solitary isolated skeletal muscle relapse of DLBCL on surveillance 18 F-fluorodeoxyglucose positron emission tomography-computed tomography, after completing first-line treatment, that was subsequently confirmed with biopsy.