Computed Tomography (CT) is a painless imaging procedure in which an x-ray tube rotates around the patient and obtains a series of scan ‘slices’ through an anatomic region of interest. A dedicated high-speed computer reconstructs the received information into a series of cross-sectional anatomic images. These images can be manipulated to emphasize specific tissues such as bone or lung detail, soft tissue, and brain. CT is an excellent imaging modality to evaluate vascular anatomy such as portosystemic shunts or other congenital or acquired anomalies. CT can be used to guide both fine needle aspirates and biopsies for tissue sampling.