Secondary EBV-positive Diffuse Large B-cell Lymphoma of Skeletal Muscle from EBV-positive Primary Diffuse Large B-cell Lymphoma of Thyroid Gland: Case Report and Literature Review

Diffuse Large B-Cell Lymphoma (DLBCL) is the most common lymphoid malignancy in adults, which often takes a nonlymph nodes organ as the primary focus. Primary lymphoid malignancy of thyroid gland is not common in clinic, EBV-positive primary diffuse large B-cell lymphoma of thyroid gland is rare in clinic, and its pathogenesis, treatment and prognosis are rarely studied. We reported an 85-year-old female patient with EBV-positive primary diffuse large B-cell lymphoma of thyroid gland, and the disease eventually relapsed in skeletal muscle of the patient. The pathological type after relapse was consistent with that of the primary focus. As far as we know secondary EBV-positive DLBCL of skeletal muscle from EBV-positive primary DLBCL of thyroid gland. For elderly patients with multiple adverse prognostic factors, individualized treatment on the premise of ensuring their quality of life may be more important.