case_images: PMC10631780_01
case_images: Hess red-green test record in case 1. a Inward displacement of the dots. b Visual fields of equal size with the record conducted under 45Delta base-out prism neutralization.
case_images: cop-2023-0014-0001-534709_F01.jpg
case_images: PMC10631780_01_cop-2023-0014-0001-534709_F01.jpg
case_images: F1
case_images: Although Hess red-green test revealed inward displacement of both eyes (Fig. 1a), restriction of eye movement was not observed with Hess red-green test under prism neutralization (Fig. 1b), and comitant esotropia was confirmed.
case_images: Magnetic resonance image (MRI) of the brain in case 1. a Swollen internal nonuniform high-signal area on T2-weighted image. b Gadolinium (Gd) contrast-enhanced brain MRI model showing poor contrast on T1-weighted image. c Posttreatment MRI showing clear shrinkage of tumor.
case_images: cop-2023-0014-0001-534709_F02.jpg
case_images: PMC10631780_01_cop-2023-0014-0001-534709_F02.jpg
case_images: F2
case_images: Brain MRI revealed a swollen internal nonuniform high-signal area on T2-weighted image (Fig. 2a). On gadolinium contrast-enhanced brain MRI, the T1-weighted image had poor contrast (Fig. 2b). Local radiotherapy (1.8 Gy administered 30 times) was performed, and brain MRI showed tumor shrinkage after radiotherapy (Fig. 2c).
case_images: PMC10631780_02
case_images: Hess red-green test record and magnetic resonance image (MRI) of the brain in case 2. a Hess red-green test record. Showing visual fields of equal size with the record conducted under 40Delta base-out prism neutralization. Axial plane (b) and sagittal plane (c) Gd contrast-enhanced MRI of the brain. Showing a 16 mm x 18 mm mass protruding ventrally from the medulla oblongata on T1-weighted image. The border is indistinct, and the interior is heterogeneous.
case_images: cop-2023-0014-0001-534709_F03.jpg
case_images: PMC10631780_02_cop-2023-0014-0001-534709_F03.jpg
case_images: F3
case_images: The simple Hess red-green test was not performed; however, restriction of eye movement was not observed with the Hess red-green test under prism neutralization (Fig. 3a), and comitant esotropia was confirmed. Then he was diagnosed with pilocytic astrocytoma (Fig. 3b, c).