Calcaneonavicular Coalition - Fibrous/Cartilaginous

Axial IR

Axial T1

Sagittal IR

Sagittal T1

12 year old girl presented with foot pain.

MRI demonstrated enlongated broad anterior process of the calcaneum - anteater's nose - that showed abnormal articulation with the navicular bone.

Hyperintense signal noted at the abnormal articular ends on the IR images.

Diagnosis: Calcaneonavicular coalition Fibrous/Cartilaginous type.

Most common subtype of tarsal coalition.

Reference and further reading:

http://www.radsource.us/clinic/0812