Background: Osteoma is a benign periosteal or endosteal tumour arising commonly in the craniofacial bones and mandible. Very few reports of extra cranial osteoma have been reported.

Methods:We present case of 45 years old woman with bone lesion in left ulna later diagnosed with osteoma. Result: Open biopsy with marginal resection was performed and the patient recover with no longer symptom or reccurence.

Conclusion: Parosteal osteoma of ulna may present in long bone as well in lower incidence, with equivalent succesful rate following standard treatment algorithm.