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EX VIVO MODEL FOR THE CHARACTERIZATION AND IDENTIFICATION OF DRYWALL INTRAOCULAR FOREIGN BODIES ON COMPUTED TOMOGRAPHY

Syed, Reema, MD*; Kim, Sung-Hye, BS*; Palacio, Agustina, MD*; Nunery, William R., MD, FACS*; Schaal, Shlomit, MD, PhD

doi: 10.1097/IAE.0000000000001731
Original Study

Background: The study was inspired after the authors encountered a patient with a penetrating globe injury due to drywall, who had retained intraocular drywall foreign body. Computed tomography (CT) was read as normal in this patient. Open globe injury with drywall has never been reported previously in the literature and there are no previous studies describing its radiographic features.

Methods: The case report is described in detail elsewhere. This was an experimental study. An ex vivo model of 15 porcine eyes with 1 mm to 5 mm fragments of implanted drywall, 2 vitreous only samples with drywall and 3 control eyes were used. Eyes and vitreous samples were CT scanned on Days 0, 1, and 3 postimplantation. Computed ocular images were analyzed by masked observers. Size and radiodensity of intraocular drywall were measured using Hounsfield units (HUs) over time.

Results: Intraocular drywall was hyperdense on CT. All sizes studied were detectable on Day 0 of scanning. Mean intraocular drywall foreign body density was 171 ± 52 Hounsfield units (70–237) depending on fragment size. Intraocular drywall foreign body decreased in size whereas Hounsfield unit intensity increased over time.

Conclusion: Drywall dissolves in the eye and becomes denser over time as air in the drywall is replaced by fluid. This study identified Hounsfield Units specific to intraocular drywall foreign body over time.

This is the first study to establish an ex vivo model to investigate the computed tomography characteristics of drywall foreign bodies. Intraocular drywall foreign body was hyperdense on computed tomography and became denser as it dissolved in the eye over time.

*Department of Ophthalmology, University of Louisville, Louisville, Kentucky; and

Department of Ophthalmology, University of Massachusetts School of Medicine, Worcester, Massachusetts.

Reprint requests: Shlomit Schaal, MD, PhD, 281 Lincoln Street, Worcester, MA 01605; e-mail: S.Schaal@umassmed.edu

Supported in part by an unrestricted grant from Research to Prevent Blindness, Inc.

Poster Presented at American Academy of Ophthalmology Annual Meeting, October 17, 2016.

None of the authors has any conflicting interests to disclose.

S.-H. Kim and A. Palacio have contributed equally to the manuscript.

© 2018 by Ophthalmic Communications Society, Inc.