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Solitary myofibroma of the lumbar vertebra: adult case

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We present the first known adult case of solitary myofibroma of bone, which affected a lumbar vertebra in a 33-year-old male. Radiography identified a purely lytic lesion with a sclerotic rim in the right pedicle of L1. CT showed an expansile lytic lesion with a sclerotic rim. MRI of the lesion revealed an isointense signal on T1-weighted images, an inhomogeneously hyperintense signal on T2-weighted images, and marked enhancement with gadolinium. Pathological study showed a mixed picture of nodular proliferation of spindle-shaped myoid cells and hemangiopericytomatous proliferation of short spindle/small round cells. The tumor cells were immunoreactive for smooth muscle actin and immunonegative for desmin. This case of solitary myofibroma of bone is exceptionally rare because of its occurrence in an adult older than 20 years of age and its location at an extra-craniofacial site.

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We are grateful to K. Krishnan Unni, MB, BS, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, for reviewing the pathological slides.

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Correspondence to E. Konishi.

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Konishi, E., Mazaki, T., Urata, Y. et al. Solitary myofibroma of the lumbar vertebra: adult case. Skeletal Radiol 36 (Suppl 1), 86–90 (2007).

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