We present the case of a 32-year-old-woman who was admitted to the hospital for evaluation of pericardial effusion. The subsequent diagnostic workup revealed the presence of a mediastinal mass along with systemic lupus erythematosus (SLE). The patient underwent thymectomy, and histological evaluation of the resected mass revealed thymic follicular hyperplasia without evidence of malignancy. SLE disease activity was promptly controlled by corticoids. Clinicians should be aware of the occasional association of autoimmune disorders with focal thymic hyperplasia, which might be confused with thymomas or thymocarcinomas.
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