Plateau iris configuration in eyes with narrow-angle: an ultrasound biomicroscopic study.

PURPOSE: To investigate, through ultrasound biomicroscopy images, the presence of plateau iris configuration in eyes with narrow-angle from patients with open-angle glaucoma and in eyes with previous acute primary angle-closure and compare the biometric features of eyes with plateau iris configuration with those of normal eyes. METHODS: Ultrasound biomicroscopic images from 196 patients with open-angle glaucoma and narrow-angle and 32 patients with acute primary angle-closure were retrospectively analyzed. The inclusion and specific criteria for the diagnosis of plateau iris configuration was the presence of an anterior positioning of the ciliary processes, supporting the peripheral iris so that it was parallel to the trabecular meshwork; the iris root had a steep rise from its insertion point, followed by a downward angulation from the corneoscleral wall; presence of a central flat iris plane; an absent (complete plateau iris configuration) or partially absent (incomplete plateau iris configuration) ciliary sulcus. The ultrasound biomicroscopic parameters were compared between complete and incomplete plateau iris configuration. The same parameters of both groups were compared with those of normal eyes. The following measurements were performed: anterior chamber depth; angle opening distance at 500 microm from the scleral spur; peripheral iris thickness at 500 microm from the scleral spur; iris-ciliary process distance; trabecular-ciliary process distance and angle recess area. RESULTS: Plateau iris configuration was found in 33 eyes of 20 (10.2%) out of 196 patients with open-angle glaucoma and narrow-angle and in 4 eyes of 2 (6.3%) out of 32 patients with acute primary angleclosure. Seventeen (77.3%) patients with plateau iris configuration were female and 5 (22.7%) male. Twenty-three (62.2%) out of 37 eyes had complete plateau iris configuration, and 14 (37.8%) had incomplete plateau iris configuration. Complete and incomplete plateau iris configuration presented similar biometric features with the exception of the iris-ciliary process distance. All plateau iris configuration eyes showed biometric parameters completely different from those of normal eyes except for peripheral iris thickness at 500 microm from the scleral spur. CONCLUSIONS: Plateau iris configuration was present in 10.2% of patients with open-angle glaucoma and narrow-angle and in 6.3% of patients with acute primary angle-closure. Biometric features were similar in eyes with complete and incomplete plateau iris configuration with the exception of iris-ciliary process distance. Compared to normal eyes, all plateau iris configuration eyes showed biometric parameters completely different except for peripheral iris thickness at 500 microm from the scleral spur.

Plateau iris configuration in eyes with narrow-angle: an ultrasound biomicroscopic study / Configuração da íris em platô em olhos com seio camerular estreito: um estudo ultrabiomicroscópico

PURPOSE: To investigate, through ultrasound biomicroscopy images, the presence of plateau iris configuration in eyes with narrow-angle from patients with open-angle glaucoma and in eyes with previous acute primary angle-closure and compare the biometric features of eyes with plateau iris configuration with those of normal eyes. METHODS: Ultrasound biomicroscopic images from 196 patients with open-angle glaucoma and narrow-angle and 32 patients with acute primary angle-closure were retrospectively analyzed. The inclusion and specific criteria for the diagnosis of plateau iris configuration was the presence of an anterior positioning of the ciliary processes, supporting the peripheral iris so that it was parallel to the trabecular meshwork; the iris root had a steep rise from its insertion point, followed by a downward angulation from the corneoscleral wall; presence of a central flat iris plane; an absent (complete plateau iris configuration) or partially absent (incomplete plateau iris configuration) ciliary sulcus. The ultrasound biomicroscopic parameters were compared between complete and incomplete plateau iris configuration. The same parameters of both groups were compared with those of normal eyes. The following measurements were performed: anterior chamber depth; angle opening distance at 500 µm from the scleral spur; peripheral iris thickness at 500 µm from the scleral spur; iris-ciliary process distance; trabecular-ciliary process distance and angle recess area. RESULTS: Plateau iris configuration was found in 33 eyes of 20 (10.2 percent) out of 196 patients with open-angle glaucoma and narrow-angle and in 4 eyes of 2 (6.3 percent) out of 32 patients with acute primary angleclosure. Seventeen (77.3 percent) patients with plateau iris configuration were female and 5 (22.7 percent) male. Twenty-three (62.2 percent) out of 37 eyes had complete plateau iris configuration, and 14 (37.8 percent) had incomplete plateau iris configuration. ...

OBJETIVO: Investigar, através de imagens de biomicroscopia ultrassônica, a presença de configuração da íris em platô em olhos com seio camerular estreito em portadores de glaucoma primário de ângulo aberto e em olhos com fechamento angular primário agudo. Avaliar as características biométricas nestes olhos, comparando-os a olhos normais. MÉTODOS: As imagens de biomicroscopia ultrassônica foram analisadas retrospectivamente, sendo que 196 pacientes eram portadores de glaucoma primário de ângulo aberto e 32 pacientes eram portadores de fechamento angular primário agudo. O critério de inclusão para configuração da íris em platô baseado em imagens de biomicroscopia ultrassônica foi definido pela presença de corpo ciliar posicionado anteriormente, íris acentuadamente angulada em seu ponto de inserção seguida de uma angulação descendente a partir da parede corneoescleral, íris central plana e sulco ciliar ausente (configuração da íris em platô completa) ou parcialmente ausente (configuração da íris em platô incompleta). Os parâmetros biométricos medidos pela biomicroscopia ultrassônica foram comparados entre os olhos com configuração da íris em platô completa e incompleta. Os mesmos parâmetros de ambos os grupos foram comparados com os de olhos normais. Foram medidos: profundidade central da câmara anterior; a distância da abertura do ângulo a 500 µm do esporão escleral; a espessura da íris a 500 µm do esporão escleral; a distância íris-processo ciliar, a distância faixa trabecular-processo ciliar e a área de recesso angular. RESULTADOS: A configuração da íris em platô foi encontrada em 33 olhos de 20 pacientes portadores de glaucoma primário de ângulo aberto (10,2 por cento de um total de 196) e 4 olhos de 2 pacientes portadores de fechamento angular primário agudo (6,3 por cento de um total de 32). Dezessete (77,3 por cento) eram do sexo feminino e 5 (22,7 por cento) do sexo masculino. Dos 37 olhos, 23 (62,2 por cento) apresentaram configuração ...

[Iridociliary cysts on ultrasound biomicroscopic examinations]. / Prevalência de cistos iridociliares em exames de biomicroscopia ultra-sônica.

PURPOSE: To present the prevalence of iridociliary cysts in eyes of patients submitted to UBM examination. METHODS: We analyzed retrospectively the UBM images of 1157 patients in the period from September 1995 to June 2004. The inclusion criterion was the UBM examination had been made on the four quadrants (superior, inferior, nasal and temporal) of the eyes. The cysts were assessed and classified in relation to their number in each quadrant; localization and morphology. Using the UBM Pro 2000 software we took the measurements of the largest diameter, wall thickness and area of the cysts besides the angle recession area (ARA). RESULTS: The prevalence of the cysts was 4.9%. No statistical difference was found between the prevalence of cysts regarding gender or between the right and left eyes. They were more prevalent in the inferior (39.8%) and temporal (29.1%) quadrants. The cysts with the largest diameter and area were located in the temporal and superior quadrants. No difference was found in relation to cysts' wall thickness in all quadrants. CONCLUSIONS: No statistical difference was found between the prevalence of cysts as concerns gender or between the right and left eyes. However, the cysts were more prevalent in the inferior and temporal quadrants. The locations of the largest cysts are preferentially the temporal and superior quadrants. The angle recession area was smaller in the temporal and superior quadrants. The cysts' wall thickness is practically the same in all quadrants. The diagnosis of iridociliary cysts was an occasional finding in 64.3% of the patients.

Prevalência de cistos iridociliares em exames de biomicroscopia ultra-sônica / Iridociliary cysts on ultrasound biomicroscopic examinations

OBJETIVO: Relatar a prevalência de cistos iridociliares em olhos de pacientes submetidos à biomicroscopia ultra-sônica (UBM). MÉTODOS: Analisaram-se retrospectivamente as imagens de UBM de 1.557 pacientes examinados de setembro de 1995 a junho de 2004. O critério de inclusão foi a UBM ter sido realizada nos quatro quadrantes (superior, inferior, nasal e temporal) do globo ocular. Avaliaram-se e classificaram-se os cistos quanto: a) ao número em cada quadrante; b) ao quadrante de localização; c) à morfologia, medindo o maior diâmetro (vertical ou horizontal), a maior espessura da parede e a área da lesão cística; d) à área de recesso angular (ARA) para cada um dos quadrantes em que havia cisto; e) à hipótese diagnóstica e/ou indicação da UBM. Utilizou-se o "software" UBM Pro 2000 para medir o diâmetro, a espessura da parede, a área do cisto e a ARA. RESULTADOS: Foram encontrados 103 cistos em 56 pacientes correspondendo à prevalência de 4,9 por cento numa amostra de 1.132 pacientes selecionados. Dos 1.132 pacientes, 650 (57,4 por cento) eram do sexo feminino e 482 (42,6 por cento) eram do sexo masculino. Dos 56 pacientes com cisto, 37 (66,1 por cento) eram do sexo feminino e 19 (33,9 por cento) eram do sexo masculino. Dos 1.480 olhos examinados, 774 (52,3 por cento) eram olhos direitos e 706 (47,7 por cento) eram olhos esquerdos. Foram encontrados cistos em 38 (64,4 por cento) olhos direitos e 21 (35,6 por cento) olhos esquerdos. Não houve diferença estatisticamente significativa entre os sexos nem entre os olhos direito e esquerdo. Os cistos com maior média de diâmetro e área estavam localizados nos quadrantes temporal e superior, onde foram encontrados os menores valores de grau de abertura do seio camerular. CONCLUSÕES: Os cistos iridociliares são mais prevalentes nos quadrantes inferior e temporal. Os cistos de maior diâmetro e área situam-se nos quadrantes temporal e superior onde encontram-se menores valores médios de grau de abertura do seio camerular.A espessura da parede dos cistos é praticamente a mesma nos quatro quadrantes. Em 64,3% dos pacientes, a presença de cistos foi um achado ocasional do exame de UBM.

PURPOSE: To present the prevalence of iridociliary cysts in eyes of patients submitted to UBM examination. METHODS: We analyzed retrospectively the UBM images of 1157 patients in the period from September 1995 to June 2004. The inclusion criterion was the UBM examination had been made on the four quadrants (superior, inferior, nasal and temporal) of the eyes. The cysts were assessed and classified in relation to their number in each quadrant; localization and morphology. Using the UBM Pro 2000 software we took the measurements of the largest diameter, wall thickness and area of the cysts besides the angle recession area (ARA). RESULTS: The prevalence of the cysts was 4.9 percent. No statistical difference was found between the prevalence of cysts regarding gender or between the right and left eyes. They were more prevalent in the inferior (39.8 percent) and temporal (29.1 percent) quadrants. The cysts with the largest diameter and area were located in the temporal and superior quadrants. No difference was found in relation to cysts' wall thickness in all quadrants. CONCLUSIONS: No statistical difference was found between the prevalence of cysts as concerns gender or between the right and left eyes. However, the cysts were more prevalent in the inferior and temporal quadrants. The locations of the largest cysts are preferentially the temporal and superior quadrants. The angle recession area was smaller in the temporal and superior quadrants. The cysts' wall thickness is practically the same in all quadrants. The diagnosis of iridociliary cysts was an occasional finding in 64.3 percent of the patients.