The case of EDH seen in conjunct with SDH, thickened crescentic or wave shape appeared, accompanied with local skull fracture but no mass effect and the hematoma was crossing the suturae cranii.

• 结论：颅板下薄层出血的内、外缘形态，有否占位效应，与外伤部位的相互关系是不同性质出血的鉴别诊断要点；