Objective To estimate outcomes of patients with acute subdural hematomas by analysing the hematoma thickness,midline shift and the differences between them. Methods Ninety-five patients with acute subdural hematoma were retrospectively studied by calculating hematoma thickness, midline shift and their difference with a statistical analysis of Kalpan-Mann-Mhitney U test. Results The hematoma thickness ranged form 5. 0 to 40.0 mm and midline shift was from 0 to 35. 0 mm. Among these patients, 51% died and 49% survived after surgery. 18 patients (19 %) showed good or satisfactory results. Kalpan-Meier analysis proved that the survival for patients with hematoma thickness approximately equal to 17 mm and a midline shift 15 mm or whose midline shift exceeded hematoma thickness by 2. 2 mm, the survival rate was 50 %. Glasgow outcome scale scores were coorelated significantly with these parameters. Conclusion The hematoma thickness, midline shift and their difference provided a database from which criteria
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