The anteater nose sign refers to an anterior tubular prolongation of the superior calcaneus which approaches or overlaps the navicular on a lateral radiograph of the foot. This fancifully resembles the nose of an anteater and is an indication of calcaneonavicular coalition
the appearance on a lateral view of the foot of an abnormal bony fusion of the calcaneus and navicular bones accompanied by a bony bar (tarsal coalition) extending between the two bones, with an elongated tubule-like extension of the anterior and superior process of calcaneus, fancifully likened to an anteater’s elongated nose.
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