title: Extraskeletal chondroma on the sole of the foot.
abstract: A 47-year-old female presented with a solitary mass located in the plantar region of her left foot. The mass, which she noticed 2 years ago, grew gradually and caused increasing pain when bearing weight. Physical examination showed a 3.5-cm diameter tender nonmobile mass with firm consistency in the midplantar region. Radiographs showed a ring-like calcification compatible with cartilage tissue. Magnetic resonance imaging revealed a lobulated mass with a hypointense signal on T1-weighted images and a hyperintense signal on T2-weighted images in the mid-substance of the plantar fascia. After a skin incision was performed, the mass was dissected from the skin and subcutaneous tissue. Then, a marginal excision was performed. The histological assessment reported chondrocytes within lacunae embedded in a chondroid matrix with focal calcification. The definitive diagnosis was extraskeletal chondroma. Plantar pain resolved within 3 months and no recurrence was found at the 1-year follow-up.
  
  
  METHODS
  Therapeutic Level IV, Case Report.
authors.affiliation: Departments of Orthopaedics (TV, CC, TL), Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand.
authors.forename: Tanawat
authors.initials: T
authors.lastname: Vaseenon
authors.forename: Chaiyarit
authors.initials: C
authors.lastname: Cheewawattanachai
authors.forename: Nuttaya
authors.initials: N
authors.lastname: Pattamapaspong
authors.forename: Jongkolnee
authors.initials: J
authors.lastname: Settakorn
authors.forename: Taninnit
authors.initials: T
authors.lastname: Leerapun
mesh_terms: D002114:Calcinosis / Q000000981:diagnostic imaging; D002812:Chondroma / Q000473:pathology / Q000601:surgery*; D005260:Female; D005534:Foot Diseases / Q000473:pathology / Q000601:surgery*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D011859:Radiography
keywords: MRI; extraskeletal chondroma; magnetic resonance imaging