Lumbar Spine Osteochondroma Causing Sciatalgia: An Unexpected Presentation in Hereditary Multiple Exostoses

Osteochondroma, the most common benign tumor of the bone also known as exostosis, is ararity in the spine. it occurs in solitary or multiple forms. the multiple form is often hereditaryand is usually called hereditary multiple exostoses (hme). the precise diagnosis of spinalosteochondroma is performed by ct and mri.we report a case of hme in a 17-year-old man with a positive family history. the tumor wasin continuity with l4 vertebra and the spinal canal stenosis was evident. the full recoverywas successful after tumor resection.