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Updated: Nov 23, 2025
Role of Diffusion MRI Tractography in Endoscopic Endonasal Skull Base Surgery
Published on: July 5, 2021
Endoscopic frontal recess anatomy directed by the drainage pathways using the connecting plates as landmarks
Weihong Jiang1, Shaobing Xie2, Zhihai Xie2
1Department of Otolaryngology-Skull Base Surgery, Xiangya Hospital, Central South University, Xiangya Road 87, Changsha, 410008, Hunan, People's Republic of China. jiangwh68@126.com.
Purpose:
To investigate the anatomical features of frontal recess (FR) drainage, and the classification of FR cells and frontal sinus (FS).
Methods:
Fifty sides from 30 adult cadaver heads were examined. FR cells and FS along the drainage pathways were dissected under 0° and 70° endoscopic views using unique connecting structures between the uncinate process and the ethmoid bulla as landmarks.
Results:
Connecting plates between the uncinate process and the ethmoid bulla were discovered and termed medial suprainfundibular plate (MSIP), which were observed on each cadaver head, and lateral suprainfundibular plate (LSIP) on 92% (46/50) sides. Separated by MSIP, two drainage pathways were identified and named medial pathways of the FR (MPFR) medial to the MSIP and the lateral pathways of the FR (LPFR) in the lateral side. Different drainage pathways of the FS were confirmed, in which drained into the MPFR in 37 and into the LPFR in 13 of the cadaver sides.
Conclusions:
MSIP is the critical landmark for the recognition of MPFR, LPFR, and the classification of FR cells. The FR resection along LPFR and MPFR facilitated excellent exposure of FS.
