الفهرس 
Patients and MethodsOnly 14 pages are availabe for public view
 |  | from | 361 |  |  |
| | | from | 361 | | |
Abstract
The vertebrate skull is adapted to support and contain the brain and special senses. When the roof of the calvaria (skull cap) is removed, the floor of the calvaria (the skull base) is exposed. It shows a natural and clearly defined subdivision into three regions: the anterior, middle (central) and posterior cranial fossae. The base of the skull is an anatomic region where a variety of congenital, inflammatory and neoplastic lesions may deveop (Valvassori et al., 1995). The base of the skull is an anatomic region where a variety of congenital, inflammatory and neoplastic lesions may develop. The vertebrate skull is adapted to support and contain the brain and special senses. When the roof of the calvaria (skull cap) is removed, the floor of the calvaria (the skull base) is exposed. It shows a natural and clearly defined subdivision into three regions: the anterior, middle and posterior cranial fossae, when viewed from below, however, the extra cranial surface of the anterior cranial fossa can not be visualized as clearly as the corresponding surfaces of the middle and posterior cranial fossae (Valvassori et al., 1995). The regions above the palate (include the cerebellopontine angle cistern and temporal bone, the base of the skull, the para nasal sinuses, the orbits, the meninges and the cranial nerves that exit the base of the skull) have historically been a difficult area to image with any modality, because of the detailed anatomy and numerous important structures that traverse it. There are two primary issues that must be addressed by the radiologist in