title: Mass-induced unilateral hallux valgus.
abstract: Various causes of hallux valgus exist. However, mass-induced hallux valgus is a rare phenomenon. To the best of our knowledge, there has been 1 previous report on mass-induced hallux valgus in the English literature; however, that report described giant cell tumor of the extensor digitorum longus tendon sheath. We believe ours to be the first published case of osteochondroma of the second metatarsus-induced hallux valgus. A 19-year-old woman presented with pain and tenderness in the left hallux of 3 months' duration. After a diagnosis of bony mass with hallux valgus, an operative excision was performed through a dorsal approach on the first web space of the left foot. The histopathologic diagnosis was osteochondroma. One-year follow-up radiographs showed a decreased hallux valgus angle and intermetatarsal angle. Unilateral hallux valgus occurs in a mass area. After excision of the mass, hallux valgus angle and intermetatarsal angle decrease. The rotational deformity is not severe. There is little probability of discovering its etiology, but mass-like osteochondroma should be considered.
authors.affiliation: Foot and Ankle Service, Department of Orthopedic Surgery, Eulji Hospital, Eulji University, College of Medicine, Seoul, Korea.
authors.forename: Ki Won
authors.initials: KW
authors.lastname: Young
authors.forename: Kyung Tai
authors.initials: KT
authors.lastname: Lee
authors.forename: Jeong Ja
authors.initials: JJ
authors.lastname: Kwak
authors.forename: Young Koo
authors.initials: YK
authors.lastname: Lee
authors.forename: Young Uk
authors.initials: YU
authors.lastname: Park
mesh_terms: D001859:Bone Neoplasms / Q000150:complications* / Q000601:surgery*; D005260:Female; D006215:Hallux Valgus / Q000209:etiology* / Q000601:surgery*; D006801:Humans; D015831:Osteochondroma / Q000150:complications* / Q000601:surgery*; D055815:Young Adult