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 a rarity in the spine. It occurs in solitary or multiple forms. The multiple form is often hereditary and is usually called hereditary multiple exostoses (HME). The precise diagnosis of spinal osteochondroma 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 was in continuity with L4 vertebra and the spinal canal stenosis was evident. The full recovery was successful after tumor resection.