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We report a case of calcinomatous polyarthritis presenting rheumatoid arthritis-like polyarthritis as the initial symptom of gastric cancer. A 79-year-old male visited to our hospital with complaint of pain and swelling of multiple joints including bilateral hands, bilateral knees, elbows and small joints of fingers. He also complained of neck and back stiffness. Both of rheumatoid factor test and anti-cyclic citrullinated peptide antibody were negative. Non-steroidal anti-inflammatory drug did not relieve his arthritic pain. He showed anorexia, body weight loss and was anemic. Upper gastrointestinal endoscopic evaluation demonstrated a gastric cancer. The patient underwent subtotal gastrectomy. Within 1 week after the subtotal gastrectomy, both polyarthritis and stiffness started to improve. The polyarthritis in this case was diagnosed as calcinomatous plyarthritis for its features. Paraneoplastic rheumatism remains a rare event, but knowledge of it is essential for early diagnosis of underlying cancer.

A case of calcinomatous polyarthritis presenting rheumatoid arthritis-like polyarthritis as the initial symptom of gastric cancer