Codman triangle

Codman triangle

Codman triangle (previously referred to as Codman's triangle) is a term used to describe 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 in 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.[1]

References

  1. ^ a b General Practioner's notebook
  2. ^ Periosteal Reaction
v · d · eEponymous medical signs for skeletal system and joints
Joints
low back pain (Waddell's signs)
low back flexibility (Ott test, Schober test)
sacroiliitis (Larrey's sign)
Skeletal/bone
Teeth

M: JNT

anat(h/c, u, t, l)/phys

noco(arth/defr/back/soft)/cong, sysi/epon, injr

proc, drug(M01C, M4)

M: BON/CAR

anat(c/f/k/f, u, t/p, l)/phys/devp/cell

noco/cong/tumr, sysi/epon, injr

proc, drug(M5)

M: TTH

anat/devp/phys

noco/cong/jaws/tumr, epon, injr

dent, proc (endo, orth, pros)

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