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,        Purpose: To present our experience in transcatheter arterial embolization (TAE) for hematoma formation related to variable causes. We analyzed the factors that could affect clinical outcomes. Materials and Methods: A retrospective study was conducted on 50 patients (24 men, 36 women; mean age, 63.8 years) who were treated for a TAE to control bleeding. Computed tomography (CT) scans showed the formation of hematomas. We classified the patients into three groups depending on the underlying cause of the hematoma i.e., spontaneous, traumatic or iatrogenic groups. We evaluated relevant factors such as sex, age, hematoma size and liquefaction, extravasation on CT, injured artery, onset to procedure time, embolization material, hospital day. Results: TAE was successfully performed in all patients. The proportions of patients in the spontaneous, traumatic, and iatrogenic bleeding groups were 36% (18/50), 42% (21/50), and 22% (11/50), respectively. Using the Mann Whitney U test, the international normalized ratio (INR) was statistically different for the spontaneous bleeding group (p = 0.013). In addition, the INR (p = 0.038) and platelet count (p = 0.004) were significant different for the traumatic group. Also, the platelet counts were related to clinical successes (p = 0.046). Conclusion: Based our experience, TAE is a safe and effective treatment option for the management of hematoma formation. Furthermore, the interventional radiologist should consider the cause of hematoma formation in order to perform proper treatment. Index terms Bleeding Hematoma Therapeutic Embolization

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Transcatheter Arterial Embolization for Acute Arterial Extravasation with Hematoma Formation: Classified the Group as Cause and Their Clinical Outcomes