Giant Convexity Chondroma of the Dura Matter Presenting with Epilepsy

Convexity chondromas are very rare benign extra-axial tumors that tend to present with protracted symptomatology, and as large non-enhancing dural based masses. We report one of the largest convexity chondromas that presented with 2 years of epilepsy, and review the pertinent literature especially as it relates to presentation, pathogenesis and management. We conclude that despite the rarity of the condition, convexity chondromas should be considered as part of the differential of large extra-axial lesions, especially when they are non-enhancing on MRI, and have a slowly progressive presentation. Surgical gross total removal is associated a good outcome.