Acute Spontaneous Posterior Fossa Haemorrhage

Non-traumatic posterior fossa haemorrhage is a significant cause of intracranial haematomas and strokes,with a small amount of mass effect having dramatic effects due to its small volume. Timely investigations and management are essential to maximise good outcomes.

Format: Paperback / softback
Length: 26 pages
Publication date: 29 February 2024
Publisher: Cambridge University Press

Posterior fossa haemorrhage, a non-traumatic occurrence, constitutes approximately 10% of all intracranial haematomas and 1.5% of all strokes. Due to its confined volume, even a small amount of mass effect within the posterior fossa can have significant consequences. This can occur through the immediate transmission of pressure to the brainstem, the obstruction of the aqueduct of Sylvius, or the compression of the fourth ventricle, resulting in acute obstructive hydrocephalus. This condition carries a risk of tonsillar herniation. Timely investigations and management are crucial in optimizing patient outcomes. This Element provides a concise overview of posterior fossa haemorrhage, encompassing its anatomy, aetiology, management, and surgical considerations. It also reviews the available evidence to inform clinical practice.

The posterior fossa is a small, confined space located at the base of the brain. It is bounded by the cerebellum, medulla oblongata, and spinal cord. The cerebellum is the largest part of the posterior fossa and plays a crucial role in motor control and balance. The medulla oblongata is responsible for vital functions such as breathing, heart rate, and blood pressure. The spinal cord extends from the medulla oblongata down through the posterior fossa and is responsible for sensation and movement.

Posterior fossa haemorrhage can occur due to a variety of causes, including trauma, bleeding disorders, and vascular abnormalities. Trauma is the most common cause of posterior fossa haemorrhage, accounting for approximately 80% of cases. Bleeding disorders, such as haemophilia and von Willebrand disease, can also cause posterior fossa haemorrhage. Vascular abnormalities, such as aneurysms and arteriovenous malformations, can also lead to posterior fossa haemorrhage.

The symptoms of posterior fossa haemorrhage can vary depending on the size and location of the bleed. In some cases, the patient may experience a sudden onset of headache, nausea, and vomiting. Other symptoms may include blurred vision, difficulty walking, and loss of consciousness. In severe cases, the patient may develop respiratory distress and neurological deficits.

Diagnosis of posterior fossa haemorrhage is typically made through a combination of medical history, physical examination, and imaging studies. Magnetic resonance imaging (MRI) is the most commonly used imaging technique for diagnosing posterior fossa haemorrhage. MRI can provide detailed images of the brain and spinal cord, allowing the physician to identify the size and location of the bleed. Computed tomography (CT) scan may also be used to diagnose posterior fossa haemorrhage, particularly in cases where MRI is not available.

Management of posterior fossa haemorrhage depends on the size and location of the bleed. In some cases, the bleed may be managed conservatively with medication and bed rest. In other cases, surgery may be necessary to control the bleed and prevent further damage to the brain. Surgery may involve the use of endovascular techniques, such as embolization or coiling, to block the blood supply to the bleed. In some cases, surgical intervention may also be necessary to remove the bleed or repair damaged tissue.

The prognosis for patients with posterior fossa haemorrhage depends on a variety of factors, including the size and location of the bleed, the patient's overall health, and the response to treatment. In some cases, patients may recover completely from their injuries. In other cases, patients may experience permanent neurological deficits or death.

In conclusion, posterior fossa haemorrhage is a rare but serious condition that can have significant consequences for patients. It is important for healthcare providers to be aware of the anatomy, aetiology, management, and surgical options for posterior fossa haemorrhage to optimize patient outcomes. Timely investigations and management are essential in maximizing good outcomes.

ISBN-13: 9781009456500