Codman triangle

codman triangle

Codman triangle (previously referred to as Codman's triangle) is the triangular area of new subperiosteal bone that is created when a lesion, often a tumour, raises the periosteum away from the bone.^[1] A Codman triangle is not actually a full triangle. Instead it is often a pseudotriangle on radiographic findings with ossification on the original bone and one additional side of the triangle which forms a two sided triangle with one open side. This two sided appearance is generated due to a tumor (or growth) that is growing at a rate which is faster than the periosteum can grow or expand, so instead of dimpling, the periosteum tears away and provides ossification on the second edge of the triangle.^[2]

The main causes for this sign are osteosarcoma, Ewing's sarcoma, eumycetoma, and a subperiosteal abscess.^[3]^[4]

References

Eponymous medical signs for skeletal system and joints

Joints

Arthropathy	osteoarthritis (Bouchard's nodes/Heberden's node) dermatomyositis (Gottron's papules) DeQuervain's syndrome (Finkelstein's test) anterior shoulder instability (Jobe's test) hip dysplasia Barlow's maneuver Ortolani test

Dorsopathy	low back pain (Waddell's signs) low back flexibility Ott test Schober test sacroiliitis (Larrey's sign)

Trauma/Orthopedics	Knee: ligament (Lachman test) meniscus Apley grind test McMurray test ligament and meniscus O'Donoghue's triad Ankle: tendon Simmonds' test Shoulder: rotator cuff Hawkins–Kennedy test ligament Neer impingement sign Jobe's test Watson's test

Skeletal/bone

bone tumor (Codman triangle)

osteochondritis dissecans (Wilson test)

Teeth

Hutchinson's teeth

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