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Absence of tarsal navicular bone - bilateral

Case contributed by Dr Bahman Rasuli

Presentation

Chronic bilateral ankle and foot pain.

Patient Data

Age: 45 years
Gender: Male

Bilateral absence of navicular bones

Articulation of cuneiform bones with talus in the proximal and first metatarsal base in the distal part. 

MRI

Right ankle and foot

Congenital absence of navicular bone

Degenerative changes between the navicular and cuneiform bones as decreased space, and subchondral edema and cystic changes

Accessory ossicle next to the talus and medial cuneiform bones in the medial side

Elongated talar neck and enlarged size of the talar head

​Extension of the foot dorsal intrinsic muscles (extensor hallucis brevis and extensor digitorum brevis ) within the external opening of sinus tarsi

Termination of the posterior tibialis tendon on the accessory ossicle and talus head at the inferomedial aspect.

MRI

Left ankle and foot

Minimal mortise joint effusion

Congenital absence of navicular bone

Degenerative changes between the navicular and cuneiform bones as decreased space, and subchondral edema and cystic changes

Elongated talar neck and enlarged size of the talar head

Extension of intrinsic muscles of the foot in dorsal aspect (extensor hallucis brevis and extensor digitorum brevis ) to the external opening of sinus tarsi

Termination of the posterior tibialis tendon on the talus head at the inferomedial aspect.

Case Discussion

The absence of tarsal navicular bone is extremely rare and it's often difficult to recognize something is not there.

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Case information

rID: 87002
Published: 17th Feb 2021
Last edited: 20th Feb 2021
Inclusion in quiz mode: Included
Institution: Jame Jam Imaging Center

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