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Anteater nose sign

Dr Yuranga Weerakkody and Dr Andrew Dixon et al.

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 ^1-2.

Etymology

The sign was first described by Oestreich et. al. in 1987 ¹.

References

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1. Oestreich AE, Mize WA, Crawford AH et-al. The "anteater nose": a direct sign of calcaneonavicular coalition on the lateral radiograph. J Pediatr Orthop. 7 (6): 709-11. - Pubmed citation
2. Crim JR, Kjeldsberg KM. Radiographic diagnosis of tarsal coalition. AJR Am J Roentgenol. 2004;182 (2): 323-8. AJR Am J Roentgenol (citation) - Pubmed citation