Is it important to remove hemosiderin during the operation of cerebral cavernoma

It is generally considered important to remove the hemosiderin rim during surgical management of cerebral cavernomas, particularly in non-eloquent brain areas where seizure control is a therapeutic goal. The hemosiderin rim, composed of iron deposits from recurrent microhemorrhages, is implicated in epileptogenesis by inducing oxidative stress and gliosis in the surrounding brain tissue, contributing to seizure activity. Therefore, complete resection of the cavernoma including the surrounding hemosiderin-laden gliotic tissue is advised to reduce the risk of seizure recurrence and rebleeding Khallaf 2019 Khallaf and Abdelrahman M. 2019.

Microsurgical removal with excision of the hemosiderin ring has demonstrated improved seizure outcomes in many studies, and incomplete removal, leaving hemosiderin remnants, is associated with higher rates of seizure persistence and cavernoma recurrence Khallaf 2019 Khallaf and Abdelrahman M. 2019.

However, the decision to remove hemosiderin must be individualized based on lesion location. In eloquent brain areas where aggressive removal may risk neurological deficits, the extent of hemosiderin excision should be weighed carefully, as surgical morbidity may outweigh benefits Carrassi et al. 2025 Carrassi et al. 2025. In such cases, limited or no removal of the hemosiderin rim may be prudent to preserve function.

Current consensus thus supports removal of the hemosiderin rim during surgery for cerebral cavernomas in accessible and non-eloquent regions because it is linked to better seizure control and lower risk of rebleeding Khallaf 2019Carrassi et al. 2025 Khallaf and Abdelrahman M. 2019,Carrassi et al. 2025. Nevertheless, in eloquent or high-risk regions, surgical strategy should be tailored, sometimes sparing hemosiderin to avoid deficits, reflecting ongoing debate and patient-specific considerations in management Carrassi et al. 2025.