Overview of tools for the measurement of the orbital volume and their applications to orbital surgery

Sentucq, Camille; Schlund, Matthias; Bouet, Benjamin; Garms, Martin; Ferri, Joël; Jacques, Thibaut; Nicot, Romain

doi:10.1016/j.bjps.2020.08.101

Cited by 25 publications

(15 citation statements)

References 50 publications

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“…Additionally, statistically significant differences existed in 1 angle parameter. Regarding orbital volume measurements, several methods have been suggested [13,74,75] which will lead to somewhat different results as the anterior confinement is calculated by way of different approaches (which in many reports are proprietary algorithms of the respective authors and not publicly available). Furthermore, volume calculation depends on the CT reconstruction strategy where computing on axial scans leads to larger results [62].…”

Section: Plos Onementioning

confidence: 99%

3-D cephalometry of the the orbit regarding endocrine orbitopathy, exophthalmos, and sex

et al. 2022

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Purpose This study aimed at evaluating the orbital anatomy of patients concerning the relevance of orbital anatomy in the etiology of EO (endocrine orbitopathy) and exophthalmos utilizing a novel approach regarding three-dimensional measurements. Furthermore, sexual dimorphism in orbital anatomy was analyzed. Methods Orbital anatomy of 123 Caucasian patients (52 with EO, 71 without EO) was examined using computed tomographic data and FAT software for 3-D cephalometry. Using 56 anatomical landmarks, 20 angles and 155 distances were measured. MEDAS software was used for performing connected and unconnected t-tests and Spearman´s rank correlation test to evaluate interrelations and differences. Results Orbital anatomy was highly symmetrical with a mean side difference of 0.3 mm for distances and 0.6° for angles. There was a small albeit statistically significant difference in 13 out of 155 distances in women and 1 in men concerning patients with and without EO. Two out of 12 angles showed a statistically significant difference between female patients with and without EO. Regarding sex, statistically significant differences occurred in 39 distances, orbit volume, orbit surface, and 2 angles. On average, measurements were larger in men. Concerning globe position within the orbit, larger distances to the orbital apex correlated with larger orbital dimensions whereas the sagittal position of the orbital rim defined Hertel values. Conclusion In this study, little difference in orbital anatomy between patients with and without EO was found. Concerning sex, orbital anatomy differed significantly with men presenting larger orbital dimensions. Regarding clinically measured exophthalmos, orbital aperture anatomy is an important factor which has to be considered in distinguishing between true exophthalmos with a larger distance between globe and orbital apex and pseudoexophthalmos were only the orbital rim is retruded. Thus, orbital anatomy may influence therapy regarding timing and surgical procedures as it affects exophthalmos.

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Section: Plos Onementioning

confidence: 99%

3-D cephalometry of the the orbit regarding endocrine orbitopathy, exophthalmos, and sex

et al. 2022

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“…However, there is still no accepted gold standard for measuring the orbital volume, and therefore, it has not been adopted into our practice. 8 …”

Section: Discussionmentioning

confidence: 99%

Reconstruction of Sphenoid Wing Dysplasia in Neurofibromatosis Type-1 Patients: An Evolving Technique

et al. 2022

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“…Volumetric analysis of (intra-)orbital structures has been established on the basis of both CT and MR images with comparable results [ 8 , 14 , 18 , 19 , 20 ]. In addition to fully manual segmentation (planimetry), the semi-automatic technique (with the possibility of manual adjustment) has also proven successful for volumetric analysis [ 21 , 22 ].…”

Section: Discussionmentioning

confidence: 99%

Increased Orbital Muscle Fraction Diagnosed by Semi-Automatic Volumetry: A Risk Factor for Severe Visual Impairment with Excellent Response to Surgical Decompression in Graves’ Orbitopathy

Steiert

Kuechlin

Masalha

et al. 2022

JPM

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Graves’ orbitopathy (GO) leads to increased orbital tissue and causes symptoms such as exophthalmos, functional complaints, or dysthyroid optic neuropathy. Different GO types with fat and/or muscle enlargement were identified, and increased muscle appears to particularly influence visual status and treatment response. The current study examines visual parameters dependent on orbital muscle volume fraction in a surgically treated GO cohort. After volumetric analysis of the preoperative orbital content, 83 orbits in 47 patients were categorized into predefined groups (increased or not-increased muscle fraction). All cases underwent pterional orbital decompression, and pre- and postoperative visual status was retrospectively analyzed. Forty-one orbits revealed increased and 42 orbits revealed not-increased muscle volume (mean fraction 29.63% versus (vs.) 15.60%). The preoperative visual acuity (VA) was significantly lower in orbits with increased vs. not-increased muscle volume (mean VA 0.30 vs. 0.53, difference 2.5 lines). After surgery, mean VA improved significantly by 1.7 lines in orbits with increased muscle volume. Not preoperative, but postoperative exophthalmos was significantly lower in orbits with not-increased muscle volume. Increased orbital muscle is associated with significantly reduced VA, but can be remarkably improved by pterional orbital decompression. Therefore, surgical therapy should be considered particularly in decreased VA with orbital muscle enlargement.

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Overview of tools for the measurement of the orbital volume and their applications to orbital surgery

Cited by 25 publications

References 50 publications

3-D cephalometry of the the orbit regarding endocrine orbitopathy, exophthalmos, and sex

3-D cephalometry of the the orbit regarding endocrine orbitopathy, exophthalmos, and sex

Reconstruction of Sphenoid Wing Dysplasia in Neurofibromatosis Type-1 Patients: An Evolving Technique

Increased Orbital Muscle Fraction Diagnosed by Semi-Automatic Volumetry: A Risk Factor for Severe Visual Impairment with Excellent Response to Surgical Decompression in Graves’ Orbitopathy

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