Fetal optic chiasm: three steps for visualization and measurement on routine transabdominal ultrasound

Alonso, Ignacio; Azumendi, Guillermo; Romero, Madalena; Anderica, J.; Herrero, José R.; Azumendi, P.; Borenstein, M.

doi:10.1002/uog.19173

Cited by 7 publications

(10 citation statements)

References 4 publications

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“…The scanning was performed by a single experienced sonographer using a Samsung WS80A (Samsung Medison, Seoul, Korea) ultrasound machine with a 1-8-MHz transabdominal transducer. The fetal OC was visualized and measured following recently published recommended practices (12). First, the operator obtained an axial image of the fetal head in the biparietal-diameter plane.…”

Section: Methodsmentioning

confidence: 99%

“…Previous studies have suggested that measurement of the ONs is not feasible because of shadowing from the sphenoid bone (8,11). However, it was reported in a recent article (12) that the ONs could be visualized on transabdominal ultrasound. Our results showed an 85.8% (310/361) success rate for measuring normal intracranial ONs, although the repeatability test result of fetal ON measurement was not satisfactory (interobserver ICC 0.798, intraobserver ICC 0.775).…”

Section: A B Cmentioning

confidence: 97%

“…An echoanatomic correlation study by Paladini et al (11) has confirmed that the structure identified as the OC on ultrasound is indeed the anatomical structure. In this study, we adopted the methodology described by Alonso et al (12), which assesses the decussation, intracranial ONs, and OTs in the axial plane by 2D transabdominal ultrasound. Our results demonstrated excellent intraobserver repeatability and interobserver reproducibility on the decussation measurements, which are more reproducible than those of the OTs and the ONs.…”

Section: A B Cmentioning

confidence: 99%

“…The fetal OC can be directly assessed by magnetic resonance imaging (MRI) (7). Some prenatal studies have also been carried out to evaluate the OC using transabdominal and transvaginal ultrasound with or without three-dimensional (3D) imaging (8)(9)(10)(11)(12). However, few studies have used two-dimensional (2D) transabdominal ultrasound to explore the normal dimensions of the OC, ONs, and OTs during pregnancy.…”

Section: Introductionmentioning

confidence: 99%

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Dimensions of the optic chiasm: quantitative ultrasound comparison between fetuses with anophthalmia/microphthalmia and normal fetuses

Wu¹,

Zheng²,

He³

et al. 2021

Quant Imaging Med Surg

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Background: The precise pathogenesis of anophthalmia/microphthalmia remains unknown. Prenatal observation of the optic chiasm in fetuses with this malformation would assist in understanding the embryonic development of the condition. The present study aimed to establish the normal fetal size ranges of decussation of the optic chiasm, optic nerves, and optic tracts in the axial plane using two-dimensional transabdominal ultrasound throughout gestation and to compare these ranges to the corresponding values in fetuses with anophthalmia/microphthalmia Methods: In total, 310 normal fetuses and 16 fetuses with anophthalmia/microphthalmia were included in this study. The widths of the decussation of the optic chiasm, optic nerves, and optic tracts of normal fetuses at 19-40 weeks' gestation were measured in the axial plane by two-dimensional transabdominal ultrasound.The same widths were retrospectively measured in the axial plane using three-dimensional ultrasound in fetuses with anophthalmia/microphthalmia and compared to the results from the normal fetuses.Results: The decussation, optic nerves, and optic tracts of 310 normal fetuses were measured. The normal widths of the decussation of the optic chiasm, optic nerves, and optic tracts increased linearly with gestational age. The interobserver and intraobserver reproducibility was excellent for the decussation but relatively low for the optic nerves and optic tracts. The optic nerve width of fetuses with anophthalmia/microphthalmia was significantly smaller than that of normal fetuses (P<0.001), but the widths of the decussation (P=0.061) and optic tracts (P=0.053) were not significantly different between the two groups. Conclusions:The normal ranges of the decussation of the optic chiasm, optic nerves, and optic tracts established in this study can provide a quantitative basis for prenatal evaluation of the optic pathway. Fetal anophthalmia/microphthalmia may be associated with optic nerve hypoplasia.

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Section: Methodsmentioning

confidence: 99%

Section: A B Cmentioning

confidence: 97%

Section: A B Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dimensions of the optic chiasm: quantitative ultrasound comparison between fetuses with anophthalmia/microphthalmia and normal fetuses

Wu¹,

Zheng²,

He³

et al. 2021

Quant Imaging Med Surg

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“…[19] It is noteworthy that reference intervals determined in the study by Haratz et al are smaller than values obtained by 3D ultrasound imaging by Bault et al [7] The results we found in our study are closer to the 3D measurements of Bault et al Alonso et al showed that optic chiasm can be fully visualized by fetal ultrasonography. [20] In their study, Vinal et al showed that it would be possible to evaluate fetal optic chiasm from the coronal plane with transvaginal ultrasound. [21] However, optic nerve measurement was not defined in these studies.…”

Section: Discussionmentioning

confidence: 99%

Ultrasound imaging of the fetal optic nerve from a different plane

Toprak¹,

Işıkalan²

2021

Perinatal J

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Objective In this study, we aimed to visualize the fetal optic nerve and its sheath in a lateral oblique plane by ultrasound. Methods This cross-sectional prospective study was conducted at 20–22 weeks of gestation on healthy pregnant women who applied to our perinatology clinic for anomaly screening. Optic nerve sheath diameter (ONSD) measurements were taken from the lateral orbital and the retroorbital planes twice by the same sonographer. Ultrasound durations were recorded. Intraobserver variability was calculated for both techniques. The Bland-Altman analysis was performed for the lateral orbital technique. Results A total of 45 pregnant women were evaluated in the study. The intraclass correlation coefficient value of the lateral orbital technique was 0.722 (p<0.001), suggesting that the ONSD was measured similarly by the same observer. The ONSD mean measured by the lateral orbital (LO) technique was higher than the ONSD mean measured by the retroorbital (RO) technique (2.10±0.13 vs 1.21±0.13 mm, p<0.001). The ONSD measurement with the LO technique was determined to be more time-effective than the RO technique (129.6±31.3 vs 228.2±32.7 sec, p<0.001). Conclusion It is demonstrated that by using the lateral orbital technique, the optic nerve and its sheath can be visualized separately without the shadowing artifact of the lens. This technique also takes less time than the RO technique. There is a need for more extensive research on this subject with magnetic resonance imaging (MRI) confirmation.

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Visualization of the Third Ventricle, the Future Cavum Septi Pellucidi, and the Cavum Veli Interpositi at 11+3 to 13+6 Gestational Weeks on 3D Transvaginal Ultrasound Including Normative Data

et al. 2022

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Objectives To show the development of the third ventricle, commissural plate, future cavum septi pellucidi, and cavum veli interpositi in weeks 12–14 by transvaginal 3D ultrasound. Methods This is a prospective transvaginal 3D study carried out to define the third ventricle and the diencephalic midline structures surrounding it. 93 of 387 fetuses in which the commissural plate with the future cavum septi pellucidi, cavum veli interpositi, and the roof of the third ventricle could be well visualized, were selected with the choroid plexus of the third ventricle and the pituitary gland serving as leading structures. In a small number of fetuses, the optic chiasm could also be displayed. In addition, the following measurements were performed: third ventricle craniocaudal and anteroposterior, roof of the third ventricle/cavum veli interpositi, and fcsp. Results The sonomorphologic characteristics of the commissural plate, the future cavum septi pellucidi, and the cavum veli interpositi are described IN 9% OF THE FETUSES examined. Measurements of the third ventricle, cavum veli interpositi, and the roof of the third ventricle show the following results: 3rd V cc = 3.895 + 0.091*CRL mm; 3rd V ap = 4.175 + 0.036*CRL mm; CVI ap = 2.223 + 0.029*CRL mm; CVI cc = 0.139 + 0.02*CRL mm. Conclusion Transvaginal neurosonography enables visualization and measurement of the normal fetal third ventricle at 12–14 weeks of gestation including visualization of the future cavum septi pellucidi and the cavum veli interpositi. BEFORE USE IN PATIENTS CAN BE CONSIDERED, FURTHER SCIENTIFIC WORK IS REQUIRED.

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Fetal optic chiasm: three steps for visualization and measurement on routine transabdominal ultrasound

Cited by 7 publications

References 4 publications

Dimensions of the optic chiasm: quantitative ultrasound comparison between fetuses with anophthalmia/microphthalmia and normal fetuses

Dimensions of the optic chiasm: quantitative ultrasound comparison between fetuses with anophthalmia/microphthalmia and normal fetuses

Ultrasound imaging of the fetal optic nerve from a different plane

Visualization of the Third Ventricle, the Future Cavum Septi Pellucidi, and the Cavum Veli Interpositi at 11+3 to 13+6 Gestational Weeks on 3D Transvaginal Ultrasound Including Normative Data

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