case_images: PMC9110380_01
case_images: Initial head computed tomography revealed no hemorrhagic findings.
case_images: SNI-11-350-g001.jpg
case_images: PMC9110380_01_SNI-11-350-g001.jpg
case_images: F1
case_images: Head computed tomography (CT) was performed and detected no abnormal finding [Figure 1].
case_images: Brain magnetic resonance imaging (FLAIR) on day 2 after head injury, it revealed no hemorrhagic lesions including contusion.
case_images: SNI-11-350-g002.jpg
case_images: PMC9110380_01_SNI-11-350-g002.jpg
case_images: F2
case_images: Brain MRI also detected no abnormal findings as the previous head CT [Figure 2].
case_images: Head computed tomography on day 3 after head injury; it was appeared that left acute subdural hematoma with mass effect.
case_images: SNI-11-350-g003.jpg
case_images: PMC9110380_01_SNI-11-350-g003.jpg
case_images: F3
case_images: ASDH with mass effect [Figure 3].
case_images: Postoperative images. Upper: Brain magnetic resonance imaging (FLAIR) showed hemostatic scar by monopolar coagulator (white arrow). Lower: Head computed tomography: Hematoma has been evacuated.
case_images: SNI-11-350-g004.jpg
case_images: PMC9110380_01_SNI-11-350-g004.jpg
case_images: F4
case_images: Postoperative CT and MRI revealed no re-bleeding and indicated the bleeding point [Figure 4].