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Sample text
Temporal horn dilatation is an early sign of hydrocephalus. 4. Focal low-density lesions representing ischemia due to vasculitis. (a) (b) Fig. 9. (a, b) Tuberculous meningitis. (a) Axial non-contrast CT shows dilated temporal horns of the lateral ventricles (arrows) and increased density in the suprasellar, interpeduncular and ambient cisterns (arrowheads). (b) Post-contrast CT shows marked meningeal enhancement along the basal cisterns (arrows). 16 Chapter 1: Head 5. Look for signs of venous thrombosis.
Axial non-contrast CT (i) shows a subtle crescentic area of relatively increased density in the ascending aorta (arrow). Axial CECT (ii) shows low-density ascending aortic wall thickening (arrow) and smooth inner aortic wall margin (arrowhead). (d) Pseudo intimal flap. Axial non-gated CTA shows multiple short segment curvilinear low-density areas (arrowheads) which are changing in positions. 30 Chapter 2: Cardiovascular and chest 3. 4. 5. 6. visible on the scan. There may be further communication between the false and true lumen distally (re-entry point).
This is readily achievable using the latest multi-detector CT. The study should be gated if the primary clinical indication is to rule out aortic Fig. 1. Triple rule-out. Coronal “triple rule out” CTA dissection. image shows a main pulmonary artery aneurysm It is more challenging to carry out a (arrow) with resultant significant compression of the left main stem coronary artery (arrowhead). “triple rule out” protocol for aortic dissection/aneurysm, pulmonary embolism, and coronary artery disease, especially in the ER setting.