Comparison of the lacrimal gland dimensions and volume in unilateral Ahmed glaucoma valve versus trabeculectomy: a high-resolution computerized tomography study
Author: Mehmet Serhat Mangan
Base Hospital / Institution: University of Health Sciences, Haydarpasa Numune Education and Research Hospital, Sadik Eratik Eye Institute, Division of Ophthalmic Plastic and Reconstructive Surgery
ePoster presentation
Abstract ID: 24-237
Purpose
A radiographic evaluation of the orbital soft tissues following glaucoma surgeries have been documented in small series with limited follow-up. Still, there has been no published data on radiological lacrimal gland (LG) volume and dimensional analysis. The aim of this study to evaluate changes in LG volume and dimensions in Ahmed glaucoma valve (AGV)- versus trabeculectomy-treated eyes and contralateral non-treated eyes.
Methods
In this cross-sectional cohort study, 1616 medical records of consecutive glaucoma patients who were followed-up and underwent glaucoma surgeries, either AGV implantation (group 1) or trabeculectomy (group 2), between 2010 and 2020 were reviewed retrospectively. The hospital workstation software was used to assess high-resolution computed tomography (HRCT) scans conducted under standard protocol using a 128 SL Optima CT 660 scanner. The software (VitreaTM) was used to perform semi-quantitative volumetric measurements. LG dimensions were obtained in the axial and coronal planes on each side, and four measures were generated using the widest LG tip-to-tip diameters in two planes: coronal length, coronal width (CW), axial length (AL), and axial width. Scans were reviewed by two experienced radiologists who were blinded to the patients’ medical records.
Results
Groups 1 and 2 each contained 19 and 18 glaucoma patients of comparable age (p>0.05). The time interval between surgery and HRCT imaging was 50.9±26.2 months. Group 1 had significantly lower LG volume than group 2 (594.1±259.4 vs. 933.6±294 mm3, p=0.001). When compared to non-treated eyes, AGV-treated eyes had lower LG volume (p=0.065) while trabeculectomy-treated eyes had higher LG volume (p=0.031). Further, group 1 had decreased length and width in both the axial and coronal planes as compared to group 2, with AL and CW being significantly different (p<0.05).
Conclusion
Despite being performed in the same quadrant, AGV and trabeculectomy affected LG volume and dimensions differently. HRCT appears to be effective in analyzing AGV position, which may be related to LG volumetric and dimensional issues.
Additional Authors
| First name | Last name | Base Hospital / Institution |
|---|---|---|
| Ayse Ozlem | Balik | University of Health Sciences, Haydarpasa Numune Education and Research Hospital, Sadik Eratik Eye Institute, Division of Ophthalmic Plastic and Reconstructive Surgery |
| Hamidu Hamisi | Gobeka | University of Health Sciences, Haydarpasa Numune Education and Research Hospital, Sadik Eratik Eye Institute, Division of Ophthalmic Plastic and Reconstructive Surgery |
| Ceren | Karabiber Deveci | University of Health Sciences, Haydarpasa Numune Education and Research Hospital, Sadik Eratik Eye Institute, Division of Ophthalmic Plastic and Reconstructive Surgery |
| Serhat | Imamoglu | University of Health Sciences, Haydarpasa Numune Education and Research Hospital, Sadik Eratik Eye Institute, Division of Ophthalmic Plastic and Reconstructive Surgery |
