Results: types of UP's superior attachment: insertion to the lamina papyracea, insertion to both the lamina papyracea and the junction of the middle turbinate with the crirbifrom plate, insertion to the junction of middle turbinate with the crirbifrom plate, insertion to the skull base, insertion to the middle turbinate, insertion to both the lamina papyracea and the posterior wall of the AN cell, insertion to both the lamina papyracea and the frontal process of Maxilla, insertion to both the lamina papyracea and the skull base, insertion to both the lamina papyracea and the middle turbinate, insertion to both the lamina papyracea - the skull base and the middle turbinate, insertion to both the lamina papyracea - the frontal process of Maxilla - the skull by on MSCT64, the AN cell was medially superiorly and inferiorly bound by the UP.