Acquired Vitelliform Lesions in Intermediate Age-Related Macular Degeneration: A Cross Sectional Study

PURPOSE

This study aims to define the characteristics of acquired vitelliform lesions (AVLs) in patients with intermediate age-related macular degeneration (iAMD).

DESIGN

Retrospective, observational, cross sectional study.

SUBJECTS

This study included 217 eyes with AVLs associated with iAMD, and an equivalent number of control patients.

METHODS

OCT scans were evaluated for qualitative and quantitative parameters at both the eye and lesion level. Eye-level parameters included the presence of: hyporeflective core drusen, intraretinal hyperreflective foci (IHRF), subretinal drusenoid deposits, macular pachyvessels, central retinal thickness, and central choroidal thickness. Lesion-level qualitative parameters included the presence of ellipsoid zone (EZ) and external limiting membrane disruption overlying the AVL, IHRF overlying the AVL, AVL overlying drusen, pachyvessels under the AVL, a solid core within AVL, and AVL location. Lesion-level quantitative characteristics included AVL height and width, AVL distance from the fovea, and sub-AVL choroidal thickness.

MAIN OUTCOME MEASURES

The primary outcomes assessed included the frequency of IHRF, the presence of macular pachyvessels, central choroidal thickness, and the dimensions (both height and width) of AVLs.

RESULTS

Comparing the AVL and control groups, the frequency of IHRF (AVL: 49.3% vs. control: 26.3%) and macular pachyvessels (37.3% vs. 6.9%) was significantly higher in the AVL case group, and the central choroidal thickness (256.8 ± 88 μm vs. 207.1± 45 μm) was thicker in the AVL group. Acquired vitelliform lesions located over drusen, with overlying IHRF, or situated subfoveally, and AVL lesions with EZ disruption were found to have a greater lesion height and width compared with AVL lesions lacking these characteristics (P value < 0.001 for all). Additionally, a significant negative correlation was observed between the distance from the fovea and AVL height (Spearman rho: -0.19, P = 0.002) and width (Spearman rho: -0.30, P = 0.001).

CONCLUSIONS

This study represents the largest reported cohort of AVL lesions associated with iAMD. Novel findings include the higher frequency of pachyvessels in addition to the presence of a thicker choroid in these eyes, as well as the greater height and width of AVL closer to the foveal center. These findings may offer insights into pathophysiologic mechanisms underlying the development of AVL.

FINANCIAL DISCLOSURE(S)

Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.

Predictive Factors Influencing the Evolution of Acquired Vitelliform Lesions in Intermediate Age-Related Macular Degeneration Eyes

PURPOSE

In this study, we identify risk factors that predict the progression of acquired vitelliform lesions (AVLs) over time.

DESIGN

Retrospective cohort study.

SUBJECTS

One hundred sixty-three eyes of 132 patients with a diagnosis of intermediate age-related macular degeneration (iAMD) with AVL.

METHODS

This retrospective study evaluated consecutive eyes with AMD from a retina clinic population and included 1181 patients and 2362 eyes. After excluding cases with associated geographic atrophy, macular neovascularization (MNV), vitreomacular traction, and those with <2 years of follow-up data, the final analysis cohort consisted of 163 eyes (132 patients) with ≥1 AVL. The first available visit in which an AVL was evident was considered the baseline visit, and follow-up data were collected from a visit 2 years (± 3 months) later. Progression outcomes at the follow-up visit were classified into 6 categories: resorbed, collapsed, MNV, stable, increasing, and decreasing. Subsequently, we analyzed the baseline characteristics for each category and calculated odds ratios (ORs) to predict these various outcomes.

MAIN OUTCOME MEASURES

The study focused on identifying predictive factors influencing the evolution of AVL in iAMD eyes.

RESULTS

In total, 163 eyes with AVL had follow-up data at 2 years. The collapsed group demonstrated a significantly greater baseline AVL height and width compared with other groups (P < 0.001). With regard to qualitative parameters, subretinal drusenoid deposits (SDDs) and intraretinal hyperreflective foci (IHRF) at the eye level, AVL located over drusen, and IHRF and external limiting membrane disruption over AVL were significantly more prevalent in the collapsed group compared with other groups (P < 0.05 for all comparisons). Odds ratios for progressing to atrophy after 2 years of follow-up, compared with the resorbed group, were significant for SDD (OR, 2.82; P = 0.048) and AVL height (OR, 1.016; P = 0.006).

CONCLUSIONS

The presence of SDDs and greater AVL height significantly increases the risk of developing atrophy at the location of AVL after 2 years of follow-up. These findings may be of value in risk prognostication and defining patient populations for inclusion in future early intervention trials aimed at preventing progression to atrophy.

FINANCIAL DISCLOSURES

Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.

Retinal Imaging Findings in Inherited Retinal Diseases

Inherited retinal diseases (IRDs) represent one of the major causes of progressive and irreversible vision loss in the working-age population. Over the last few decades, advances in retinal imaging have allowed for an improvement in the phenotypic characterization of this group of diseases and have facilitated phenotype-to-genotype correlation studies. As a result, the number of clinical trials targeting IRDs has steadily increased, and commensurate to this, the need for novel reproducible outcome measures and endpoints has grown. This review aims to summarize and describe the clinical presentation, characteristic imaging findings, and imaging endpoint measures that are being used in clinical research on IRDs. For the purpose of this review, IRDs have been divided into four categories: (1) panretinal pigmentary retinopathies affecting rods or cones; (2) macular dystrophies; (3) stationary conditions; (4) hereditary vitreoretinopathies.

Atrophic Lesions Associated with Age-Related Macular Degeneration: High-Resolution versus Standard OCT

OBJECTIVE

The objective of this study was to determine whether high-resolution OCT (HR-OCT) could enhance the identification and classification of atrophic features in age-related macular degeneration (AMD) compared with standard resolution OCT.

DESIGN

Prospective, observational, cross-sectional study.

SUBJECTS

The study included 60 eyes from 60 patients > 60 years of age with a diagnosis of AMD.

METHODS

The participants underwent volume OCT scanning using HR-OCT and standard resolution OCT devices. Trained graders reviewed and graded the scans, identifying specific regions of interest for subsequent analysis.

MAIN OUTCOME MEASURES

The study focused on identifying and classifying complete retinal pigment epithelium (RPE) and outer retinal atrophy (cRORA), incomplete RORA (iRORA), and other nonatrophic AMD features. Additionally, qualitative and quantitative features associated with atrophy were assessed.

RESULTS

The agreement among readers for classifying atrophic lesions was substantial to perfect for both HR-OCT (0.88) and standard resolution OCT(0.82). However, HR-OCT showed a higher accuracy in identifying iRORA lesions compared with standard OCT. Qualitative assessment of features demonstrated higher agreement for HR-OCT, particularly in identifying external limiting membrane (ELM) (0.95) and ellipsoid zone (EZ) disruption (0.94). Quantitative measurements of features such as hypertransmission defects, RPE attenuation/disruption, EZ disruption width, and ELM disruption width showed excellent interreader agreement with HR-OCT (> 0.90 for all features) but only moderate agreement with standard OCT (0.51-0.60).

CONCLUSIONS

The study results suggest that HR-OCT improves the accuracy and reliability of classifying and quantifying atrophic lesions associated with AMD compared with standard resolution OCT. The quantitative findings in particular may have implications for future research and clinical practice, especially with the availability of therapeutic agents for treating geographic atrophy and the development of commercially available HR-OCT devices.

FINANCIAL DISCLOSURE(S)

Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.

Assessment of intraretinal hyperreflective foci using multimodal imaging in eyes with age-related macular degeneration

PURPOSE

This study aimed to investigate the correspondence between intraretinal hyperreflective foci (IHRF) identified on optical coherence tomography (OCT) B-scans with hyperpigmentation on colour fundus photography (CFP) or hyperreflectivity on infrared reflectance (IR) images in eyes with age-related macular degeneration (AMD).

METHODS

Flash CFP, IR images and OCT B-scans obtained at the same visit were evaluated. Individual IHRF identified on OCT B-scans were assessed for the qualitative presence or absence of a hypotransmission tail into the choroid. The corresponding IR image obtained at the time of OCT acquisition was analysed for the presence or absence of hyperreflectivity in this region. The IR images were manually registered to the CFP image, and CFP images were inspected for the presence or absence of hyperpigmentation at the location of IHRF.

RESULTS

From 122 eyes, a total of 494 IHRF were evaluated. For the primary analysis of qualitative presence or absence of hyperpigmentation on CFP and hyperreflectivity on IR at the locations corresponding to IHRF on OCT, 301 (61.0%) of the IHRFs demonstrated evidence of hyperpigmentation on CFP, while only 115 (23.3%) showed evidence of hyperreflectivity on IR. The qualitative determination of the presence or absence of an abnormality on CFP or IR were significantly different (p < 0.0001). 327 (66.2%) of the IHRF showed hypotransmission, and 80.4% of these IHRF showed hyperpigmentation on CFP, though only 23.9% (p < 0.0001) demonstrated hyperreflectivity on IR.

CONCLUSIONS

Less than two-thirds of IHRF evident on OCT manifest as hyperpigmentation on colour photos, though IHRF with posterior shadowing are more likely to be evident as pigment. IR imaging appears to be even more poorly sensitive for visualizing IHRF.

Choriocapillaris and Retinal Vascular Alterations in Presymptomatic Alzheimer's Disease

Purpose

To compare optical coherence tomography angiography (OCTA) retina metrics between cognitively healthy subjects with pathological versus normal cerebrospinal fluid (CSF) Aβ42/tau ratios.

Methods

Swept-source OCTA scans were collected using the Zeiss PLEX Elite 9000 and analyzed on 23 cognitively healthy (CH) subjects who had previously undergone CSF analysis. Thirteen subjects had a pathological Aβ42/tau (PAT) ratio of <2.7132, indicative of presymptomatic Alzheimer's disease (AD), and 10 had a normal Aβ42/tau (NAT) ratio of ≥2.7132. OCTA en face images of the superficial vascular complex (SVC) and deep vascular complex were binarized and skeletonized to quantify the perfusion density (PD), vessel length density (VLD), and fractal dimension (FrD). The foveal avascular zone (FAZ) area was calculated using the SVC slab. Choriocapillaris flow deficits (CCFDs) were computed from the en face OCTA slab of the CC. The above parameters were compared between CH-PATs and CH-NATs.

Results

Compared to CH-NATs, CH-PATs showed significantly decreased PD, VLD, and FrD in the SVC, with a significantly increased FAZ area and CCFDs.

Conclusions

Swept-source OCTA analysis of the SVC and CC suggests a significant vascular loss at the CH stage of pre-AD that might be an indicator of a neurodegenerative process initiated by the impaired clearance of Aβ42 in the blood vessel wall and by phosphorylated tau accumulation in the perivascular spaces, a process that most likely mirrors that in the brain. If confirmed in larger longitudinal studies, OCTA retinal and inner choroidal metrics may be important biomarkers for assessing presymptomatic AD.

Autoimmune Disease-Related Dry Eye Diseases and Their Placement Under the Revised Classification Systems: An Update

Dry eye disease (DED) is a chronic and progressive disorder involving the ocular surface, characterized by disturbances in tear film composition, instability of the tear film, and inflammation of the ocular surface. There are two forms of DED: aqueous-deficient dry eye (ADDE) and evaporative dry eye (EDE). Autoimmune diseases are systemic disorders involving multiple organs, including the eyes, and have a significant impact on DED. There have been multiple studies demonstrating the relation between autoimmune diseases and DED. This article reviews the current knowledge regarding the epidemiological characteristics, pathogenesis, and treatments of autoimmune disease-related DED.

SLIViT: a general AI framework for clinical-feature diagnosis from limited 3D biomedical-imaging data

We present SLIViT, a deep-learning framework that accurately measures disease-related risk factors in volumetric biomedical imaging, such as magnetic resonance imaging (MRI) scans, optical coherence tomography (OCT) scans, and ultrasound videos. To evaluate SLIViT, we applied it to five different datasets of these three different data modalities tackling seven learning tasks (including both classification and regression) and found that it consistently and significantly outperforms domain-specific state-of-the-art models, typically improving performance (ROC AUC or correlation) by 0.1-0.4. Notably, compared to existing approaches, SLIViT can be applied even when only a small number of annotated training samples is available, which is often a constraint in medical applications. When trained on less than 700 annotated volumes, SLIViT obtained accuracy comparable to trained clinical specialists while reducing annotation time by a factor of 5,000 demonstrating its utility to automate and expedite ongoing research and other practical clinical scenarios. *Oren Avram and Berkin Durmus equally contributed to this work. **Srinivas R. Sadda and Eran Halperin jointly supervised this study.

The relationship of diabetic retinopathy severity scales with frequency and surface area of diabetic retinopathy lesions

PURPOSE

To assess the relationship between qualitative diabetic retinopathy (DR) scales with the precise numbers and surface area of DR lesions within the Early Treatment Diabetic Retinopathy Study (ETDRS) standard seven field (S7F) region on ultrawide-field (UWF) color fundus images.

METHODS

In this study, we collected UWF images from adult patients with diabetes. Poor-quality images and eyes with any pathology precluding assessment of DR severity were excluded. The DR lesions were manually segmented. DR severity was graded according to the International Clinical Diabetic Retinopathy (ICDR) and AA protocol by two masked graders within the ETDRS S7F. These lesions' numbers and surface area were computed and correlated against the DR scores using the Kruskal-Wallis H test. Cohen's Kappa was performed to determine the agreement between two graders.

RESULTS

One thousand five hundred and twenty eyes of 869 patients (294 females, 756 right eyes) with a mean age of 58.7 years were included. 47.4% were graded as no DR, 2.2% as mild non-proliferative DR (NPDR), 24.0% as moderate NPDR, 6.3% as severe NPDR, and 20.1% as proliferative DR (PDR). The area and number of DR lesions generally increased as the ICDR level increased up to severe NPDR, but decreased from severe NPDR to PDR. There was perfect intergrader agreement on the DR severity.

CONCLUSION

A quantitative approach reveals that DR lesions' number and area generally correlate with ICDR-based categorical DR severity levels with an increasing trend in the number and area of DR lesions from mild to severe NPDR and a decrease from severe NPDR to PDR.

Current Management of Subretinal Hemorrhage in Neovascular Age-Related Macular Degeneration

Age-related macular degeneration (AMD) is the leading cause of irreversible vision loss among individuals aged 65 years and older in the USA. For individuals diagnosed with AMD, approximately 12% experience varying levels of subretinal hemorrhage (SRH), which can be further classified by size into small, medium, and massive measured in disc diameters. SRH is an acute and rare sight-threatening complication characterized by an accumulation of blood under the retina arising from the choroidal or retinal circulation. Released iron toxins, reduced nutrient supply, fibrin meshwork contraction, and outer retinal shear forces created by SRH contribute to visual loss, macular scarring, and photoreceptor damage. SRH treatment strategies aim to displace hemorrhage from the foveal region and prevent further bleeding. Although there are no standardized treatment protocols for SRH, several surgical and nonsurgical therapeutical approaches may be employed. The most common surgical approaches that have been utilized are pars plana vitrectomy (PPV) combined with multiple maneuvers such as the removal of choroidal neovascularization lesions, macular translocation, retinal pigment epithelium patch repair, SRH drainage, intravitreal injection of recombinant-tissue plasminogen activator (tPA), expansile gas and air displacement, and anti-vascular endothelial growth factor (anti-VEGF) injections. Nonsurgical therapeutical approaches include intravitreal anti-VEGF monotherapy, intravitreal tPA administration without PPV, and photodynamic therapy. This review article aims to explore the current treatment strategies and supporting literature regarding both surgical and nonsurgical, of SRH in patients with AMD. Moreover, this article also aims to highlight the distinct treatment modalities corresponding to different sizes of SRH.

Drusen morphometrics on optical coherence tomography in eyes with age-related macular degeneration and normal aging

PURPOSE

To compare drusen size metrics (apical height and basal width) on optical coherence tomography (OCT) B-scans with their size assessed on color photos in eyes with age-related macular degeneration (AMD) and normal aging.

METHODS

A total of 508 drusen were evaluated in this analysis. Flash color fundus photos (CFP), infrared reflectance (IR) images, and OCT B-scans obtained at the same visit were evaluated. Individual drusen were identified on CFPs and the diameters of the drusen were measured in planimetric grading software. CFPs were manually registered to the IR image with their corresponding OCT volume. After confirming correspondence between the CFP and OCT, the apical height and basal width of the same drusen were measured on OCT B-scans.

RESULTS

Drusen were divided into small, medium, large, and very large categories based on their diameter on the CFP images (< 63, 63 to 124, 125 to 249, and [Formula: see text] 250 μm, respectively). The OCT apical height of small drusen on CFP ranged from 20 to 31 μm, while medium drusen ranged from 31 to 46 μm, large drusen ranged from 45 μm to 111 µm, and very large drusen ranged from 55 μm to 208 μm. The OCT basal width measured < 99 μm in small drusen, from 99 to 143 μm in medium drusen, from 141 to 407 µm in large drusen, and > 209 µm in very large drusen.

CONCLUSION

Drusen of different size categories on color photographs may also be separated according to their apical height and basal width on OCT. The apical height and basal width ranges defined in this analysis may be of value in the design of an OCT-based grading scale for AMD.

Analysis of Publication Productivity and Academic Rank of Ophthalmology Residency Program Directors in the United States

PURPOSE

Female ophthalmologists are underrepresented in the field of ophthalmology. This study aimed to analyze the gender differences among ophthalmology residency program directors (PDs) in the United States with respect to academic rank, number of publications, and h-index.

METHODS

This cross-sectional study evaluated 120 ophthalmology residency PDs from 120 ophthalmology residency programs during the 2022 San Francisco Match. The gender information was collected from institutional websites. The information regarding the state of each institute, academic rank, degree (MD or DO), age, and publication productivity was also recorded.

RESULTS

From the 120 residency programs, 120 ophthalmology residency PDs were identified. Most PDs had an MD degree (118 out of 120, 98.3%), while only a few had a DO degree (2 out of 120, 1.7%). Only 31 (25.8%) out of 120 residency PDs were female. There was a statistically significant difference between female residency PDs and male residency PDs (p<0.0001). Male PDs had a higher h-index (15.2 ± 1.2) compared to their female counterparts (11.9 ± 0.97) (p=0.003). Regarding academic rank, male PD number was higher in each category, including assistant professor, associate professor, and full professor.

CONCLUSIONS

United States ophthalmology residency programs have a smaller portion of females compared to male PDs. Furthermore, full professors are more likely to be male, and males have higher publication productivity in terms of h-index. To promote equality among ophthalmologists, future initiatives should focus on addressing the gender disparities in ophthalmology residency programs and the selection of residency PDs.

Gender Disparities Among Academic Vitreoretinal Specialists in the United States With Regard to Scholarly Impact and Academic Rank

Background and objective While men outnumber women in the specialty of ophthalmology in general, the subspecialty of vitreoretinal surgery in particular has the highest percentage of men across all ophthalmic subspecialties. This study aimed to analyze the gender disparities regarding the publication productivity and academic rank of academic vitreoretinal specialists in the United States (US). Methods This cross-sectional study evaluated 116 ophthalmology residency programs in the US participating in the 2022 San Francisco Match. The academic vitreoretinal faculty from each ophthalmology residency program was included. The information on gender, academic rank, and publication activity in terms of the h-index were collected from institutional websites, the Scopus database, and the National Library of Medicine PubMed website. Results A total of 467 academic vitreoretinal specialists were identified. Among them, 345 (73.9%) were men, and 122 (26.1%) were women (p<0.001). When the academic ranks were analyzed, a higher number of men (43.8%) were found to hold the rank of full professor as compared to women. Furthermore, a higher number of women (47.5%) were found to hold the rank of assistant professor as compared to their male colleagues. Regarding the number of publications, in all academic rank categories, women had a significantly lower number of publications compared to men (p<0.001). Men also had a higher publication productivity or scholarly impact [h-index=15.2 ± 0.82 standard error of the mean (SEM)] compared to women (h-index=12.8 ± 0.99 SEM) (p=0.0004). Higher h-index correlated with higher academic rank, from assistant professor through full professor (p<0.001). Conclusion The field of vitreoretinal surgery has significantly fewer women compared to men, with women producing fewer publications and having less scholarly impact. H-index and total number of publications are also associated with a higher academic rank. Furthermore, full professors are more likely to be men, while assistant professors are more likely to be women. Future efforts should be aimed at reducing the gender disparity in vitreoretinal surgery.

Barriers to Coronavirus Disease 19 vaccination in patients with obesity

BACKGROUND

Patients with obesity are at a high risk of severe disease and death from Coronavirus Disease 2019 (COVID-19). Vaccination offers a safe and effective means of reducing this risk. The rate of COVID-19 vaccine refusal in patients with obesity is unknown.

METHODS

Patients with obesity were administered validated questionnaires assessing COVID-19 fear, general vaccine hesitancy, and COVID-19-specific vaccine hesitancy.

RESULTS

507 participants completed the study. COVID-19 vaccine hesitancy was high: Fifteen percent of patients refused COVID-19 vaccine. Hesitancy related to other vaccines was also high: Eight percent of patients refused a vaccine in the past, and 15% delayed a vaccine. Fear of side effects and doubts regarding effectiveness were the most common reasons for vaccine refusal.

CONCLUSIONS

Despite high risk for complications, vaccine hesitancy is high among patients with obesity. Targeted public health interventions are critical to reduce vaccine hesitancy and improve vaccination rates.

Effect of OCT B-Scan Density on Sensitivity for Detection of Intraretinal Hyperreflective Foci in Eyes with Age-Related Macular Degeneration

PURPOSE

To evaluate the impact of reducing the density of B-scans in an optical coherence tomography (OCT) volume on the sensitivity for detecting intraretinal hyperreflective foci (IHRF) in eyes with intermediate age-related macular degeneration (AMD).

METHODS

A total of 165 eyes with intermediate AMD and IHRF were evaluated in this retrospective analysis. For each case, Cirrus HD-OCT volumes were imported into the reading center 3 D-OCTOR software. The number of IHRF cases was assessed based on all 128 B-scans (spaced 47 μm apart), using a categorical scale (graded as 1-4, 5-9, 10-14, 15-19, and >20). Additionally, the B-scan densities in the volume were lowered to 64 B-scans (spaced 94 μm apart), 43 B-scans (spaced 140 μm apart), and 32 B-scans (spaced 188 μm apart). The number of eyes with any IHRF and the numerical category of IHRF in the eye were used to compare the sensitivity at each reduced B-scan density against the reference 128 B-scan volume.

RESULTS

In the primary analysis for the qualitative presence or absence of any IHRF, the sensitivity decreased to 98.2% (p = .32) with 64 B-scans, 92.7% (p = .001) with 43 B-scans, and 75.2% (p = .001) with 32 B-scans, compared with the 128 B-scan reference. With regard to the number of IHRF per eye, there was a significant difference (with a lower level chosen on the scale) when the B-scan density was reduced to 43 or 32 B-scans (p = .002 and p < .001, respectively).

CONCLUSION

Increasing the inter-B-scan spacing from 47 to 188 microns significantly reduced the ability to accurately determine whether IHRF were present in an eye. An increase in inter-B-scan spacing to 140 microns was associated with a significant misclassification of the IHRF quantity. These findings may be relevant in the design of OCT scanning protocols for studies utilizing these biomarkers for AMD progression.

CT angiography evaluation of intracranial aneurysms: Distribution, characteristics, and association with subarachnoid hemorrhage

Aims

To investigate the distribution, characteristics, and association with subarachnoid hemorrhage (SAH) of aneurysms identified in Turkish adult patients with computed tomography angiography (CTA) performed with suspicion of intracranial aneurysms and/or SAH.

Subjects and Methods

A total of 356 patients (164 male, and 192 female) with a mean age of 55.6 ± 4.0 (range, 18-90) years were analyzed retrospectively. The dimension in millimeters, localization, type, and multiplicity of aneurysms were noted. The differences in these parameters between females and males were investigated. The correlations of sex, aneurysm size, multiplicity, and size with SAH were researched.

Results

On 356 CTA, 140 cases were identified to have aneurysm (39.3%) (56 males [40.0%], 84 females [60.0%]). The incidence of aneurysms and SAH in females was high relative to males. In 140 patients, a total of 187 aneurysms were present (mean size, 7.25 ± 2.56 mm). The highest number of aneurysms was found in the middle cerebral artery 64 (34.2%) while the least was in posterior circulation 20 (10.7%). There was no significant difference between genders in terms of aneurysm size, type, and multiplicity. Individuals with aneurysm site on the internal carotid artery had lower SAH incidence. Receiver Operating Characteristic curve analysis results determined that individuals with aneurysm size >13.5 mm had increased incidence of SAH.

Conclusions

The general properties of intracranial aneurysms investigated with CTA in Turkish adults had similarities to information defined in the literature. These results will likely be beneficial to direct approaches to aneurysm diagnosis and treatment in routine practice.

Evaluation of coronary bypass graft occlusion and stenosis with 64-detector-row computed tomography angiography

BACKGROUND

A noninvasive imaging modality is desirable for the evaluation of coronary bypass graft stenosis and occlusion.

PURPOSE

To prospectively evaluate the effectiveness of 64-detector-row computed tomography (DCT) for the assessment of coronary bypass grafts.

MATERIAL AND METHODS

Forty-two patients (35 male, seven female, mean age 66.3 years) with 103 bypass grafts (32 arterial, 71 venous) were examined with 64-DCT. The evaluations were done by two radiologists blinded to the results of quantitative coronary angiography (QCA), used as the reference standard.

RESULTS

All of the 26 occluded grafts, nine of the 10 stenosed grafts, and 66 of the 67 patent grafts were correctly diagnosed with 64-DCT angiography. The sensitivity, specificity, and positive and negative predictive values for 64-DCT in detecting graft stenosis were 90%, 99%, 90%, and 99%, respectively. For graft occlusion, all were 100%. No statistically significant difference was found between 64-DCT and QCA for the evaluation of bypass grafts. Intermodality and interobserver agreement were excellent.

CONCLUSION

64-DCT angiography is a reliable, noninvasive diagnostic method for the assessment of coronary bypass grafts. It can be considered as a useful tool for follow-up purposes and may function as a gatekeeper before invasive procedures.