Case 3: Imaging Question 4

A CT of the head was performed without contrast. A single image is shown in comparison to a normal patient.

Questions

1. Where is the abnormality located?

Answer

2. Describe the abnormalities using appropriate terminology.

Answer

3. What is this patient as risk for developing?

Answer

4. What is your imaging differential diagnosis for the imaging findings?

• The most common cause of subarachnoid hemorrhage is trauma. However the most common cause of non traumatic subarachnoid hemorrhage is a ruptured aneurysm. In the absence of trauma, once subarachnoid hemorrhage is identified, the next step is to evaluate for an anuerysm. At many institutions this is performed with CTA. See below.

Questions (continued)

1. Where is the abnormality located on the CTA?

2. What are the different treatment options for this abnormality?