Preoperative Embolization of Glomus Tumors: Role, Effectiveness, and Complications.

Paragangliomas represent a surgical challenge due to their hypervascularization. The preoperative selective embolization of these tumors significantly decreases intraoperative blood loss. However, the literature on preoperative embolization in glomus tumors is limited. The aim of this study is to contribute additional evidence regarding the role of preoperative embolization, as well as to evaluate risks and complications in the treatment of glomus tumors. A retrospective evaluation of all the embolizations of glomus tumors from 2009 to 2023 was conducted. The primary outcome parameter was the rate of devascularization after embolization and the occurrence of significant perioperative hemorrhages. The secondary outcome was embolization-related complications. Twenty-one embolizations in 20 patients were investigated in the study. In 43% of the cases more than 90% devascularization was achieved by embolization, while in the remaining cases, 80 to 90% devascularization was reached. In one case (5%), significant perioperative bleeding after embolization occurred. In one case (5%), a symptomatic complication occurred periinterventionally due to the brief dislocation of the coaxial and microcatheter into the internal carotid artery (ICA), which led to fresh punctate DWI lesions on the subsequent MRI. No patients developed nerve palsy following embolization. The preoperative embolization of glomus tumors can lead to significant tumor devascularization and a reduction in perioperative bleeding, with a low complication rate.