Korean J Otorhinolaryngol-Head Neck Surg.  2024 May;67(5):277-282. 10.3342/kjorl-hns.2023.00621.

A Study on the Possibility of Endoscopic Modified Lothrop Procedure Using Imaging Measurements

• Koo HB
• Kwak JH
• Lee JH

• KMID: 2555808
• DOI: http://doi.org/10.3342/kjorl-hns.2023.00621

Abstract

Background and Objectives
Endoscopic modified Lothrop procedure (EMLP) is indicated after the failure of standard endoscopic sinus surgery techniques to alleviate frontal sinus disease. Three parameters, such as nasal beak thickness (NBT), accessible dimension of frontal recess (AD), and distance of frontal sinus (DFS), are important in the preoperative evaluation and selection of patients for EMLP. The purpose of this study is to apply the parameters to determine the feasibility of EMLP for the Korean population.
Subjects and Method
Sinus CT was performed on a total of 233 people, and a study was conducted using 466 bilateral sides with the following parameters: 1) NBT 2) the distance from the posterior margin of nasal beak to the anterior margin of skull base (DNBSB) 3) the right and left AD and 4) the right and left DFS. If the values of NBT, AD, and DFS of the study group were less than 10 mm, greater than 5 mm and 7 mm, respectively, they were considered candidates for the EMLP.
Results
DNBSB, NBT, AD, and DFS were 6.97±1.96 mm, 7.01±1.58 mm, 7.16±2.40 mm, and 9.47±2.91 mm, respectively. Parameters except DNBSB showed significant differences in male and female. The feasibility of EMLP was 75.36% for male and 57.89% for female, with 68.24% overall.
Conclusion
The overall feasibility of EMLP was 68.24% for the study group, where feasibility was lower for female than for male.

Keyword

Endoscopic modified Lothrop procedure; Feasibility; Frontal sinus; Nasal beak; Parameter