MCA middle cerebral artery, TCCD transcranial color-coded duplex ultrasonography TCCD was used in our patient, having undergone decompressive craniectomy, and helped in the assessment, monitoring, and decision making for the patient. Through craniectomy, TCCD could clearly visualize the cerebral aneurysm originating from the posterior cerebral artery and the turbulent blood flow within the sac (Fig. 3 a Transcranial color-coded duplex ultrasonography (TCCD) (day 4) revealing the aneurysmal sac located in the left hemisphere. b and c TCCD indicating the blood flow in the aneurysmal sac. [Extracted from the article]