CT differential diagnosis of subconjunctival fat prolapse and choristoma

VernacularTitle:眼结膜下脂肪疝与迷芽瘤的CT鉴别诊断
Author: Hao NIU ; Xiuli MA ; Jun ZHOU ; Qi AN
Publication Type:Journal Article
Keywords: Subconjunctival fat prolapse; Choristoma; Tomography; X-ray computed
From: Chinese Journal of Medical Imaging Technology 2009;25(12):2208-2210
CountryChina
Language:Chinese
Abstract: Objective To investigate CT features of subconjunctival fat prolapse and choristoma. Methods Thirty-eight patients, including 18 with subconjunctival fat prolapse and 20 with choristoma, were retrospectively analyzed. Transverse plain CT scan was performed in all the patients, and then coronal plane images was reconstructed at CT workstation. Results CT features of subconjunctival fat prolapse revealed a crescent-shaped or horn-shaped fat density mass continuous with the orbital fat in the superior temporal quadrant of the orbit. CT features of choristoma revealed a crescent-shaped or triangle fat density mass incontinuous with the orbital fat in the temporal side. Conclusion Subconjunctival fat prolapse typically occurs in bilateral superior temporal quadrant of the orbit in elderly males. Subconjunctival choristoma occurs in the unilateral temporal side in adolescent. CT is helpful to distinguish subconjunctival fat prolapse and choristoma.