title: Pure intramuscular osteolipoma.
abstract: Ossified lipoma or osteolipoma are rarely reported. It is defined as a histologic variant of lipoma that has undergone osseous metaplasia. Osteolipoma presents with a dominant osseous component within a lipoma. We report a case of a histologically confirmed osteolipoma on the nuchal ligament independent of bone. The patient was a 51-year-old female who presented with a 5-year history of a painless, progressively enlarging mass on the posterior neck. Computed tomography and magnetic resonance imaging showed a circumscribed mass compatible with fat between the C2 and C6 spinous processes with a large calcified irregular component. The mass with dual components was totally removed under general anesthesia and no recurrence was observed after 6 months of follow-up. We also reviewed the clinicopathologic features of previously reported osteolipomas in the literature and suggest that although osteolipoma is a rare variant of lipoma, it should be considered in the differential diagnosis when a lipoma of the posterior neck mixed with a bony component is encountered.
authors: Department of Neurosurgery, Spine Center, Chuncheon Sacred Heart Hospital, College of Medicine, Hallym University, Chuncheon, Korea.
authors: Jin Seo
authors: JS
authors: Yang
authors: Department of Neurosurgery, Spine Center, Chuncheon Sacred Heart Hospital, College of Medicine, Hallym University, Chuncheon, Korea.
authors: Suk Hyung
authors: SH
authors: Kang
authors: Department of Neurosurgery, Spine Center, Chuncheon Sacred Heart Hospital, College of Medicine, Hallym University, Chuncheon, Korea.
authors: Yong Jun
authors: YJ
authors: Cho
authors: Department of Neurosurgery, Spine Center, Chuncheon Sacred Heart Hospital, College of Medicine, Hallym University, Chuncheon, Korea.
authors: Hyuk Jai
authors: HJ
authors: Choi
keywords: Lipoma; Lipomatous tumor; Ossified lipoma; Ossifying lipoma; Osteolipoma