The most common tool for diagnosis and follow up of cerebral edema in ICU is brain CT scan that necessitate patient transportation with risk of hemodynamic instability, and exposure to radiation.

Transcranial Doppler (TCD) sonography allows true and rapid imaging of blood flow velocities of intracranial vessels. Transcranial Doppler sonography provides noninvasive evaluation of intracranial pressure by its characteristic wave patterns

Inclusion Criteria:

• isolated blunt Traumatic Brain Injury
• age 18-60 years

Exclusion Criteria:

• Pregnancy
• Intracerebral hemorrhage
• Patients whose blood flow velocities could not be obtained from Trans temporal acoustic bone windows.

Patients with isolated blunt TBI from (age 18-60 years) of both sex, will be included in the study and followed prospectively. Severity of trauma is evaluated by GCS, Rotterdam computed tomography score (CTS) care system with the help of our radiodiagnosis colleagues