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Coalition by MSKMRI JEE EUN LEE.pdf
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Anteater Sign
- Definition: Elongated, squared anterior process of the calcaneus resembling an anteater’s snout as it approaches the navicular.
- View: Best seen on lateral and oblique radiographs.
- Diagnostic Value: Specific (≈90–94%) but variably sensitive (10–72%). Absence does not exclude coalition.
- Pearl: Normal anterior process is short, pointed, triangular; elongation suggests coalition.
Reverse Anteater Sign (Elongated Navicular Sign)
- Definition: Lateral/posterior extension of the navicular bone, with its lateral AP dimension smaller than the medial.
- View: Best seen on AP or oblique radiographs.
- Diagnostic Value: Lower sensitivity (18–50%) but high specificity (≈100%).
- Pearl: Indicates abnormal navicular morphology contributing to coalition.
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