The Magnetic Resonance Imaging Characteristics of Radicular Cysts and Granulomas

Overview

Journal Dentomaxillofac Radiol

Publisher Oxford University Press

Date 2023 Jan 23

PMID 36688723

Authors

Natnicha Wamasing

Supasith Yomtako

Hiroshi Watanabe

Junichiro Sakamoto

Kou Kayamori

Tohru Kurabayashi

Affiliations

Soon will be listed here.

Abstract

Objectives: Limited studies have differentiated radicular cysts and granulomas with MRI. Therefore, we investigated the MRI characteristics of the two lesions and clarified features for distinguishing between them.

Methods: We collected data of 27 radicular cysts and 9 granulomas definitively diagnosed by histopathology and reviewed the fat-saturated weighted, weighted, and contrast-enhanced fat-saturated weighted images. We measured the maximum diameter and apparent diffusion coefficient values of the lesions. We employed Fisher's exact test, the Mann-Whitney test, and independent -tests to compare the two lesions and created a decision tree for discriminating between them.

Results: There were significant differences between radicular cysts and granulomas with respect to five imaging characteristics-signal intensity of the lesion centre on fat-saturated weighted images; signal intensity, texture, and contrast enhancement of the lesion centre on contrast-enhanced fat-saturated weighted images; and maximum diameter of the lesion. The cut-off diameter for radicular cysts was 15.9 mm. The area under the receiver operating characteristic curve, sensitivity, and specificity were 0.971, 85.2%, and 100%, respectively.

Conclusions: From the decision tree analysis, maximum diameter, lesion centre contrast enhancement on contrast-enhanced fat-saturated weighted images, and lesion centre signal intensity on fat-saturated weighted images were important for discriminating between radicular cysts and granulomas.

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