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Bouchard's node
Erosion of proximal interphalangeal (PIP) joints accompanied by bony overgrowth, pathognomonic for osteoarthritis. They are less common than Heberden's nodes. They are generally hard & painless.
Related
Heberden's node
nodal osteoarthritis (of the fingers)
osteoarthritis (OA)
General
abnormal morphologic structure (malformation)
References
Saunders Manual of Medical Practice, Rakel (ed),
WB Saunders, Philadelphia, 1996, pg 774