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(A) Arthritis of the 3rd metacarpophalangeal (MCP) joint and osteoarthritic changes with Heberden nodes and prominence of the 2nd and 3rd MCP joints. (B) Close up of the middle finger near the interphalangeal joint showing a minimal scar of the rat bite (arrow). (C) Gram stain of Streptobacillus moniliformis demonstrating the typical pleomorphic necklace-like appearance responsible for its name.
