Congenital Bilateral Complete Agenesis of the Hallucal Sesamoids: A Case Report

Abstract

Objective

The purpose of this case report is to describe a patient with bilateral complete hallucal sesamoidal agenesis.

Clinical Features

A 23 year-old female presented with left 4th metatarsal head pain that is worse in the morning and prevents her from running. A week later, she had an inversion injury in the right foot while playing flag football.

Interventions and Outcomes

Radiography incidentally demonstrated bilateral complete absence of osseous hallucal sesamoids with a round, featureless 1st metatarsal head that does not have sesamoidal grooves nor an intersesamoidal crest and later confirmed lack of fibrocartilaginous nodes on ultrasonography.

Conclusion

Bilateral complete agenesis of the hallucal sesamoids is rare. This study describes a case of asymptomatic congenital bilateral complete agenesis of the hallucal sesamoids visualized on radiography and confirmed with ultrasonography.