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Background: Osteoid osteoma is a painful bone tumor that usually affects long bones. The unusual location of osteoid osteoma is rare and may be misleading and misinterpreting the diagnosis. Objective: The objective of current study was to determine and explain the unusual cases of Osteoid osteoma found in atypical location (the coccyx, iliac bone, toe, vertebral body and scapula) of patients that were referred to our institution. Patients and Methods: We examined the imaging features: Plain Film, CT Scan, MRI, Scan isotope that could alert the radiologists toward a correct diagnosis. For reviewing the literature in the field, we extracted all publications indexed as a MeSH Major Topic of “osteoma, osteoid” in MEDLINE database via PubMed search engine throughout 2006-2015. We restricted our search to case reports. Results: We determined 5 patients with atypical location of osteoid osteoma in patients referred to our hospital during years 2014-2015. The literature review of osteoid osteoma in MEDLINE showed that, there have been only 134 rare case reports about osteoid osteoma which were published and indexed in MEDLINE during the last decade (2006-2015). The rarest of rare case reports for osteoid osteoma was in Maxilla, Nasal, Ribs, and Sarcrum. Conclusion: Analysis of our study concluded that the physicians should bear in mind, the probability of osteoid osteoma, when they are considering the chronic pain in the atypical areas of patients’ body.

Atypical Location of Osteoid Osteoma in Patients Referred to Orthopedic Hospital in Tabriz