The FR is a stationary bony structure; its length, diameter, and angle are relatively constant; and it can be easily located by the data measured in this study. The FR should be protected in the process of transsphenoid approach as well as be precisely located by the procedure about it.

Pterygopalatine fossa is related to numerous neurovascular structures. Accurate understanding of the radiologic anatomy of PPF is beneficial for the PPF disease diagnosis, the selection of treatment plan and the prognosis evaluation.

Posterior communicating artery varies in different individuals, and the radiologic study of it is an optimal way to analyze the variances. The anatomic relations between PComA and basic skull structures such as the ACP and PCP are especially important for neurosurgeons.