Innovative Use of Bleomycin Electrosclerotherapy (BEST) for High-Flow Arteriovenous Malformations in the Head District: Preliminary Results of Two Cases.

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Background: According to the ISSVA 2018 classification, arteriovenous malformations (AVMs) are high-flow vascular malformations, distinct from low-flow lesions. About 60% of extracranial AVMs occur in the head and neck, making their management a focus of maxillofacial surgery. Due to their complexity, precise diagnosis and careful treatment planning are crucial for optimal aesthetics and structural preservation. The standard approach combines embolization with surgical resection, though Bleomycin electrosclerotherapy (BEST) has recently gained recognition. Methods: From July 2023 to December 2024, a total of 16 patients with vascular malformations were treated with bleomycin electrosclerotherapy at the Azienda Ospedaliera Universitaria Senese (AOUS). Among them, two patients were affected by arteriovenous malformations. These two patients underwent this treatment to avoid more invasive and demolitive procedures, considering the anatomical region involved. Both patients had previously been treated at other hospitals, experiencing subsequent lesion recurrence. Preoperative evaluation included angiographic and ultrasound studies. The patients underwent electrosclerotherapy sessions and were closely monitored during follow-up. The uniqueness of this innovative approach lies in the use of fractionated doses of bleomycin for each treatment session, compared to the standard protocols described in the literature. Results: BEST has demonstrated efficacy in the treatment of high-flow AVMs by delivering bleomycin into the interstitial tissue and subsequently applying electroporation so the drug's effects can be precisely localized and amplified. The macroscopically evident results, patient satisfaction, and, most importantly, the objective ultrasound flow data demonstrate the effectiveness of this treatment. Conclusions: Arteriovenous malformations (AVMs) pose treatment challenges due to their variability and lack of standardized guidelines. This study explores electrosclerotherapy with bleomycin in two head and neck AVM cases, using fractionated doses to enhance safety and efficacy. The findings support its potential as a minimally invasive alternative, warranting further research on broader applications.