Abstract
A woman in her 60s presented with erythema on both elbows, dyspnea on exertion, discomfort, and swelling of the left upper extremity, followed by swelling and myalgia of the right upper and lower extremities. She was diagnosed with anti-TIF1γ antibody-positive dermatomyositis with interstitial pneumonia. The initial screening tests for malignant diseases including contrast-enhanced CT, upper and lower endoscopy, and gynecological examination did not reveal any obvious abnormalities. The patient experienced two recurrent episodes of muscle weakness and dysphagia during treatment with intravenous glucocorticoids and cyclophosphamide. Five months after diagnosis, a bone marrow biopsy and positron emission tomography- computed tomography (PET-CT) scan revealed a coronary malignant lymphoma with suspected systemic metastasis. Although chemotherapy was initiated, the patient ultimately succumbed to alveolar hemorrhage. Coronary lymphoma is very rare and there has been no report of a cases associated with myositis. PET-CT may be useful for searching malignancy in anti-TIF1γ antibody-positive dermatomyositis cases of recurrent relapse.
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