Subarachnoid Hemorrhage (SAH): Computed Tomography Scan Findings

This noncontrast CT scan was taken from a patient with a subarachnoid haemorrhage. The white arrows are pointing to areas in the subarachnoid space (or more specifically, the basilar cisterns and the sulci). In this patient, those areas are hyperdense (i.e., lighter shade of grey than what is normal). In the appropriate clinical context, high-attenuation in these locations indicates the presence of blood and thus a subarachnoid hemorrhage. Now let’s compare it with the normal CT scan on the right. The black arrow in this CT scan also points to a location in the subarachnoid space. But in this patient, the signal is isodense (i.e., dark grey), which is the normal shade of cerebrospinal fluid on a CT scan. So when a subarachnoid hemorrhage is suspected, the diagnosis is confirmed by finding areas of high-attenuation in subarchnoid space.

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Disclaimer: All the information provided by Medical Education for Visual Learners and associated videos are strictly for informational purposes only; it is not intended as a substitute for medical advice from your health care provider or physician. If you think that you or someone that you know may be suffering from a medical condition, then please consult your physician or seek immediate medical attention.

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