title: Osteoid osteoma of the pisiform: A case report.
abstract: BACKGROUND
  Osteoid osteoma is an uncommon benign bone-forming tumor of the musculoskeletal system but it is the most common primary bone tumor of the carpal region. However, only seven cases of its pisiform involvement have been described.
  
  
  METHODS
  We present a 19 year-old male patient with osteoid osteoma of the pisiform which initially could not be detected in any diagnostic study for long standing wrist pain. The patient was treated with excision and curettage. In 1 year of follow-up, the patient was asymptomatic without recurrence.
  
  
  CONCLUSIONS
  In cases with long standing ulnar wrist pain, one should consider osteoid osteoma of the pisiform in differential diagnosis. If an OO is suspected, thin slice CT scan in initial evaluation would be valuable in preventing the patient from misdiagnosis or delay in diagnosis.
authors.affiliation: Department of Orthopedics and Traumatology, Istanbul University Cerrahpasa Medical Faculty, Istanbul, Turkey. Electronic address: kaynak95@yahoo.com.
authors.forename: Gokhan
authors.initials: G
authors.lastname: Kaynak
authors.affiliation: Department of Orthopedics and Traumatology, Istanbul University Cerrahpasa Medical Faculty, Istanbul, Turkey. Electronic address: mfguven@yahoo.com.
authors.forename: Mehmet Fatih
authors.initials: MF
authors.lastname: Guven
authors.affiliation: Department of Orthopedics and Traumatology, Istanbul University Cerrahpasa Medical Faculty, Istanbul, Turkey. Electronic address: ozanaerdal@yahoo.com.
authors.forename: Ozan Ali
authors.initials: OA
authors.lastname: Erdal
authors.affiliation: Department of Orthopedics and Traumatology, Istanbul University Cerrahpasa Medical Faculty, Istanbul, Turkey. Electronic address: huseyinbotalioglu@yahoo.com.
authors.forename: Huseyin
authors.initials: H
authors.lastname: Botanlioglu
authors.affiliation: Department of Orthopedics and Traumatology, Istanbul University Cerrahpasa Medical Faculty, Istanbul, Turkey. Electronic address: muharrem.babacan@gmail.com.
authors.forename: Muharrem
authors.initials: M
authors.lastname: Babacan
authors.affiliation: Department of Pathology, Istanbul University Cerrahpasa Medical Faculty, Istanbul, Turkey. Electronic address: serguled@yahoo.com.
authors.forename: Sergulen
authors.initials: S
authors.lastname: Dervisoglu
mesh_terms: D018771:Arthralgia / Q000209:etiology; D001859:Bone Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010017:Osteoma, Osteoid / Q000000981:diagnostic imaging* / Q000601:surgery*; D051220:Pisiform Bone / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed; D014955:Wrist Joint / Q000601:surgery*; D055815:Young Adult
keywords: Osteoid osteoma; Pisiform