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Immune-related adverse events have been reported in patients treated with anti-programmed death-1 receptor drugs such as nivolumab. We present a case of a new-onset seronegative rheumatoid arthritis in a patient with metastatic melanoma treated with nivolumab.

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Sclerosing mesenteritis (SM), a benign chronic fibrosing inflammatory disease of the mesentery, is a rare disease discovered in 1924. The prevalence of the disease is less than 1%. The exact etiology of the disease is not clear. It is thought that the integrity of the gastrointestinal lumen may be altered from chronic inflammatory effects. SM may be associated with autoimmune diseases, trauma, malignancy, or surgery. The most common clinical presentation is abdominal pain. Obstructive symptoms may occur. Diagnosis is made by CT abdomen and biopsy. Treatment includes surgical and immunosuppressive medications.

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