Subarachnoid Hemorrhage CT Imaging Manifestations

Written by Shen Jiang Chao

Radiology

Updated on February 20, 2025

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Subarachnoid hemorrhage is caused by the rupture of cerebral blood vessels due to various reasons, allowing blood to flow into the subarachnoid space. Common causes include trauma and rupture of congenital aneurysms. Subarachnoid hemorrhage caused by the rupture of congenital aneurysms typically presents on a CT scan with high-density appearances at the base of the skull in the brain pools, especially widespread columnar high-density appearances in the suprasellar cistern, lateral fissure cistern, anterior interhemispheric fissure, and around the circumferential pool. If the subarachnoid hemorrhage is due to trauma, the abnormalities are more localized, generally appearing in the brain pool or cerebral sulcus on the side of injury with high-density appearances, and may also be accompanied by hematomas within the ventricles or bleeding in other locations.

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Written by Zhang Hui

Neurology

1min 2sec

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Does subarachnoid hemorrhage have a genetic component?

Subarachnoid hemorrhage, this disease does not have a significant genetic tendency, so there is no need to worry excessively. The main cause of the bleeding is the rupture of an aneurysm, which is due to abnormal blood vessel development resulting in fusiform aneurysms that rupture and bleed under certain conditions. Additionally, there are other causes of subarachnoid hemorrhage, such as long-term smoking which can cause arterial disease, some arteriovenous malformations are also prone to rupture and bleed, and some traumatic injuries can also lead to subarachnoid hemorrhage; these are not hereditary. Subarachnoid hemorrhage is a rather dangerous condition, so it is essential to control risk factors, properly manage blood pressure, and absolutely avoid smoking. If severe headaches, nausea, and vomiting occur, it is crucial to be highly vigilant and seek medical attention at a hospital immediately.

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Written by Li Ai Ping

Neurology

51sec

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What to do with a headache from subarachnoid hemorrhage?

Subarachnoid hemorrhage, the most typical symptom of which is headache, often manifests as a sudden severe throbbing or bursting pain. The pain may be localized to a specific area of the head, or it may affect the entire head or neck, and it generally persists continuously. If such a headache occurs, one should first rest in bed, avoid emotional excitement and exerting great force, such as coughing, shouting loudly, or straining during bowel movements, etc. If the pain is unbearable, one can ask a doctor for appropriate pain relief medication. However, if the headache suddenly worsens, one should be cautious of the condition deteriorating and should seek medical advice to investigate the cause of the worsening headache. One should not blindly request medication for pain relief, as it may mask the underlying condition.

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Written by Zhang Hui

Neurology

1min 11sec

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Differentiation between subarachnoid hemorrhage and cerebral hemorrhage

Subarachnoid hemorrhage and cerebral hemorrhage, though both involve bleeding, have different mechanisms of onset. The first distinction is that cerebral hemorrhage is generally caused by hypertension. Hypertension leads to hyaline degeneration and fibrinoid necrosis of arteries, resulting in bleeding. In contrast, the most common cause of subarachnoid hemorrhage is an aneurysm, which may be related to factors such as smoking and congenital developmental abnormalities. In terms of clinical presentation, cerebral hemorrhage has a sudden onset, with symptoms of headache, nausea, vomiting, but also includes impairments in language functions, and signs of neurological deficits such as limb paralysis. Subarachnoid hemorrhage, on the other hand, typically involves very severe pain, usually without manifestations such as limb paralysis. Furthermore, from a radiological perspective on CT imaging, cerebral hemorrhage is mainly located in the brain parenchyma, while subarachnoid hemorrhage mainly indicates that the site of bleeding is in the subarachnoid space.

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Written by Shen Jiang Chao

Radiology

1min

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Subarachnoid Hemorrhage CT Imaging Manifestations

Subarachnoid hemorrhage is caused by the rupture of cerebral blood vessels due to various reasons, allowing blood to flow into the subarachnoid space. Common causes include trauma and rupture of congenital aneurysms. Subarachnoid hemorrhage caused by the rupture of congenital aneurysms typically presents on a CT scan with high-density appearances at the base of the skull in the brain pools, especially widespread columnar high-density appearances in the suprasellar cistern, lateral fissure cistern, anterior interhemispheric fissure, and around the circumferential pool. If the subarachnoid hemorrhage is due to trauma, the abnormalities are more localized, generally appearing in the brain pool or cerebral sulcus on the side of injury with high-density appearances, and may also be accompanied by hematomas within the ventricles or bleeding in other locations.

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Written by Tang Bo

Neurology

50sec

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Is subarachnoid hemorrhage considered a minor injury?

Subarachnoid hemorrhage depends on the amount of bleeding and the location to determine the severity of the condition. It can be life-threatening in severe cases. If symptoms such as headache and severe vomiting occur, the possibility of subarachnoid hemorrhage should be considered. Initially, a cranial CT scan should be conducted to confirm the diagnosis. Further investigations should include cranial MRI or CTA vascular imaging, preferably CTA, to determine whether there is rupture bleeding caused by an aneurysm. In such cases, it is necessary to consider whether emergency surgery is required, based on the amount of bleeding and the condition of the blood vessels, and the possibility of an aneurysm to guide further treatment.