a triangular area of new bone seen on X-ray at the edge of a malignant bone tumour resulting from elevation of the *periosteum by malignant tissue. It is most often seen in *osteosarcomas. [E. A. Codman (1869–1940), US surgeon]
(Scarpa’s triangle) a triangular depression on the inner side of the thigh bounded by the sartorius and adductor longus muscles and the inguinal ligament. The pulse can be felt here as the femoral artery lies over the depression.... femoral triangle
a weak area in the abdomen bounded by the iliac crest (below), the external oblique muscle (in front), and the erector spinae muscle (behind). It can be the site of a lumbar hernia.... lumbar triangle
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