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Asian J Neurosurg. 2019 Jan-Mar;14(1):304-306. doi: 10.4103/ajns.AJNS_163_18.

Spinal Intradural Extramedullary Bizarre Parosteal Osteochondromatous Proliferation of Bone (Nora's Lesion): First Case Report.

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Department of Neurosurgery, Faculty of Medicine, Paris Descartes University, Paris, France.
Department of Neurosurgery, King Faisal Medical City, Abha, Saudi Arabia.
Department of Neurosurgery, Faculty of Medicine, Sorbonne University, Paris, France.
Department of Surgery, Faculty of Medicine, Umm Al-Qura University, Makkah Al-Mukarramah, Saudi Arabia.
Department of Neurosurgery, Amiens University Medical Center, Amiens, France.
Department of Neurosurgery, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia.
Department of Neurosurgery, Pitié-Salpêtrière University Hospital, Paris, France.


Bizarre parosteal proliferation of bone (Nora's lesion) is a known bony lesion that affects mainly hands and feet. In this article, we present the first case of spinal intradural extramedullary Nora's lesion along with the management. Radiologically, the tumor was initially diagnosed as a meningioma. However, histopathological analysis confirmed bizarre parosteal proliferation of bone. It was successfully managed by surgical resection followed by physical rehabilitation.


Bizarre parosteal proliferation of bone; Nora's lesion; intradural tumors; spinal cord compression; spinal tumors

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