“…This can prove time‐consuming, expensive, and often unrewarding. Multiple myeloma (9), carcinoma of the prostate (9), bronchogenic carcinoma (5, 6), pleural mesothelioma (5), and squamous‐cell carcinoma of the esophagus (6) have all been reported as presenting manifestations difficult to distinguish from acute rheumatoid arthritis. In our experience, though actual synovitis may occur as part of the mesenchymal reaction associated with malignancy, it must be rare, whereas a secondary fibrositic reaction (so‐called nonarticular rheumatism) manifested by morning stiffness and the gelling phenomenon is not uncommonly associated with a wide variety of malignancies and, indeed, may represent the initial and most prominent symptom.…”