How does an acute subdural hematoma occur?

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Subdural hematoma is usually caused by a head injury, such as from a fall, motor vehicle collision, or an assault. The sudden blow to the head tears blood vessels that run along the surface of the brain. This is referred to as an acute subdural hematoma.

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A subdural hematoma (SDH) is a clot of blood that develops between the surface of the brain and the dura mater, the brain’s outer covering, usually caused by stretching and tearing of the veins on the surface. A head injury can rupture these veins if the brain is shaken or jolted suddenly.

SDHs caused by trauma are among the most lethal of all head injuries. Often accompanied by more severe generalized brain injury, they may also result in cerebral contusions.

How does an acute subdural hematoma occur? : Explained by brain tumor surgeon Dr.Kalyan Bommakanti, M.Ch

A SDH occurs in 10 percent to 20 percent of all traumatic brain injury cases and up to 30 percent of fatalities.


The best way to diagnose SDHs is with a computed tomography scan, which shows the presence of dense crescent-shaped masses.

At the time of admission to the hospital, patients with acute SDHs have low scores on the Glasgow Coma Scale (GCS).

How does an acute subdural hematoma occur? : Explained by brain tumor surgeon Dr.Kalyan Bommakanti, M.Ch


The extent of the bleeding is generally determined by the thickness of the blood clot. SDHs around 1 cm in diameter generally require immediate surgery, while smaller SDHs may not. A large craniotomy, surgery through an opening created in the skull, may be used to remove the thick blood clot and to reach bleeding sites.

Treatment that is delivered rapidly, younger adults, patients with a GCS score of 6 or 7, patients with reactive pupils, and patients with no multiple cerebral contusions or unmanageable pressure on the brain are most likely to have favorable outcomes.

SDHs are often performed in conjunction with the removal of underlying cerebral contusions.


Brain injuries can result in a wide range of recovery.

An acute SDH usually results in a mortality rate between 50 percent and 90 percent. The reason for this is the underlying brain injury and pressure that builds up on the brain during the days following the injury.

There is an approximate 20 percent to 30 percent recovery rate of brain function in these patients. Postoperative seizures are very common in these patients.

Dr.Kalyan Bommkanti is one of the best neurosurgeons in hyderabad and is also one of the best
spine surgeons in hyderabad. He received training in endoscopic spine surgeries, also known
as key hole spine surgery or minimally invasive spine surgery. He has experience in treating a
number of complicated brain surgeries, complicated spine surgeries like complex brain tumors,
complex spine tumors, complicated spine fractures, complicated head injuries. He has an
extensive experience in teaching junior doctors.

He consults and operates at: (For appointment WhatsApp on 8520003683)
Global Gleneagles hospital,Lakdikapul, Hyderabad.
Aware Global Gleneagles hospital, L.B. Nagar, Bairamulguda, Hyderabad.
Kalyan’s Neuro and Spine clinic, Kharkhana, Secunderabad.
Shenoy hospital, East Marredpally, Hyderabad.
Prasad Hospitals, Nacharam, Hyderabad.

Brain tumor clinics

For appointment see details below (+91-8520003683). Brain tumors are serious disorders and
should be treated as soon as possible. Many patients have a lot of doubts and queries
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