Question:
A patient presents with arthritis involving both DIP and PIP joints, with erosions and new bone formation. There are no skin manifestations. What is the most likely diagnosis?
A patient presents with arthritis involving both DIP and PIP joints, with erosions and new bone formation. There are no skin manifestations. What is the most likely diagnosis?
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Differentiating RA from PsA radiographically: RA only destroys bone (erosions, osteopenia). PsA both destroys and creates bone (erosions + periostitis/new bone), leading to "fluffy" margins and the pencil-in-cup deformity. DIP involvement points heavily away from RA.
Updated On: Sep 3, 2026
- Inflammatory bowel disease assiciated arthritis
- Psoriatic arthritis
- Rheumatoid arthritis
- Hemochromatosis
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The Correct Option is B
Solution and Explanation
Concept:
The radiographic hallmark of simultaneous erosive destruction and new bone proliferation (osteoproliferation) at the Distal Interphalangeal (DIP) and Proximal Interphalangeal (PIP) joints is characteristic of Psoriatic Arthritis (PsA).
Explanation:
• Psoriatic Arthritis is a unique inflammatory arthritis because it exhibits both destructive features (erosions, osteolysis) and reparative features (periostitis, new bone formation, ankylosis). This often leads to the classic "pencil-in-cup" deformity on X-ray.
• Involvement of the DIP joints is highly specific for Psoriatic Arthritis (and osteoarthritis), helping to clinically distinguish it from Rheumatoid Arthritis (RA), which typically involves the PIP and MCP joints but explicitly spares the DIP joints.
• While the question notes "no skin manifestations", up to 15% of patients with Psoriatic Arthritis develop arthritis prior to the onset of psoriasis, or may have minimal/hidden psoriatic plaques (e.g., scalp, umbilicus, natal cleft). This is termed Psoriatic Arthritis sine Psoriasis.
• Option (A), IBD-associated arthritis, typically presents as a non-destructive peripheral oligoarthritis or an axial spondyloarthritis. It does not typically cause destructive DIP/PIP erosions with new bone formation.
• Option (C), Rheumatoid arthritis, causes purely erosive changes (no new bone formation/osteophytes) and characteristically spares the DIP joints.
• Option (D), Hemochromatosis, classically causes an arthropathy involving the 2nd and 3rd MCP joints with hook-like osteophytes, not a destructive DIP/PIP polyarthritis.
Final answer:
The combination of DIP/PIP involvement with mixed erosive and proliferative bone changes makes Psoriatic Arthritis the best diagnosis, even in the absence of current skin findings.
The radiographic hallmark of simultaneous erosive destruction and new bone proliferation (osteoproliferation) at the Distal Interphalangeal (DIP) and Proximal Interphalangeal (PIP) joints is characteristic of Psoriatic Arthritis (PsA).
Explanation:
• Psoriatic Arthritis is a unique inflammatory arthritis because it exhibits both destructive features (erosions, osteolysis) and reparative features (periostitis, new bone formation, ankylosis). This often leads to the classic "pencil-in-cup" deformity on X-ray.
• Involvement of the DIP joints is highly specific for Psoriatic Arthritis (and osteoarthritis), helping to clinically distinguish it from Rheumatoid Arthritis (RA), which typically involves the PIP and MCP joints but explicitly spares the DIP joints.
• While the question notes "no skin manifestations", up to 15% of patients with Psoriatic Arthritis develop arthritis prior to the onset of psoriasis, or may have minimal/hidden psoriatic plaques (e.g., scalp, umbilicus, natal cleft). This is termed Psoriatic Arthritis sine Psoriasis.
• Option (A), IBD-associated arthritis, typically presents as a non-destructive peripheral oligoarthritis or an axial spondyloarthritis. It does not typically cause destructive DIP/PIP erosions with new bone formation.
• Option (C), Rheumatoid arthritis, causes purely erosive changes (no new bone formation/osteophytes) and characteristically spares the DIP joints.
• Option (D), Hemochromatosis, classically causes an arthropathy involving the 2nd and 3rd MCP joints with hook-like osteophytes, not a destructive DIP/PIP polyarthritis.
Final answer:
The combination of DIP/PIP involvement with mixed erosive and proliferative bone changes makes Psoriatic Arthritis the best diagnosis, even in the absence of current skin findings.
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