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Introduction MMA embolization has become an accepted procedure to decrease the recurrence of cSHD after surgical drainage. nBCA has recently received an expanded indication as an adjunct treatment to surgery for symptomatic subacute and chronic subdural hematoma. We review our single center series and examine modes of failure.Materials and Methods The hospital database was searched for patients admitted with subdural hematoma who underwent surgical drainage and MMA embolization between February 2023 and June 2026. The radiology reports and images were reviewed to determine the devices and techniques used for embolization as well as vessels embolized. Follow up imaging was reviewed to confirm successful treatment.Results 51 patients (37 male and 14 female) with mean age of 75 years underwent MMA embolization with a mixture of nBCA and lipiodol (1:5). Twenty-three (23) patients underwent bilateral MMA embolization; 28 patients underwent unilateral embolization (15 right MMA and 13 left MMA). A balloon microcatheter was used for 11 embolizations (8 patients). Technical success was obtained in 50 of 51 procedures (98%). There was clinical success in 48 of 50 technically successful procedures (96%). There were no major complications to include stroke. There was one minor complication that was successfully treated interprocedurally.In the technical failure, the balloon catheter ruptured prior to nBCA injection, and the embolization was attempted using the D5 push technique. The nBCA did not penetrate to the distal territory/capillary level. In the two clinical failures, only a single division (anterior or posterior) was embolized.Conclusion MMA embolization with nBCA combined with surgical drainage of subacute and cSDH is safe and has a high technical and clinical success rate. There is a higher likelihood of clinical failure when both MMA divisions are not embolized.Disclosures M. Radvany: None. G. Flores-Milan: None. S. Amin: None. D. Croci: None.