The mammalian optic chiasm is widely and properly regarded as a region where axons from the temporal retina take an uncrossed course and separate from axons arising in the nasal retina that take a crossed course. However, this is but a rough approximation of the adult situation, and developmental studies must take account of several distinctive stages and axon rearrangements that characterize t...

Introduction In this work, the micro-architecture of the optic nerves/chiasm/tracts were studied, in vivo, with diffusion tensor imaging (DTI) at submillimeter resolution. The optic chiasm is an interesting structure to study with DTI as it has intricate white matter architecture and could provide clinicaly relevant information in a number of conditions, such as optic pathway gliomas, pituitary...

• The optic tract syndrome is characterized by a contralateral, incongruous homonymous hemianopia, contralateral relative afferent pupillary defect (RAPD), and optic atrophy due to retrograde axonal degeneration. • Optic disc pallor often results in a pattern of bowtie atrophy of the eye with temporal field loss and atrophy of the upper and lower poles of the disc of the eye with nasal field lo...

AIM: To describe the clinical and radiologic features of retrolaminar migration silicone oil (SiO) observe dynamic position ventricular accumulation in supine prone. METHODS: For this retrospective study, 29 patients who had a history SiO injection treatment underwent unenhanced head computed tomography (CT) were included from January 2019 to October 2022. The divided into migration-positive ne...

BACKGROUND During development axons encounter a variety of choice points where they have to make appropriate pathfinding decisions. The optic chiasm is a major decision point for retinal ganglion cell (RGC) axons en route to their target in order to ensure the correct wiring of the visual system. MicroRNAs (miRNAs) belong to the class of small non-coding RNA molecules and have been identified a...

1Instituto Estadual do Cérebro Paulo Niemeyer, Departamento de Radiologia, Rio de Janeiro RJ, Brasil; 2Universidade Federal do Rio de Janeiro, Departamento de Radiologia, Rio de Janeiro RJ, Brasil. Correspondence: Bruno Niemeyer de Freitas Ribeiro; Instituto Estadual do Cérebro Paulo Niemeyer, Departamento de Radiologia; Rua do Rezende, 156; 20231-091 Rio de Janeiro RJ, Brasil; E-mail: bruno.ni...

PURPOSE To establish whether primary open-angle glaucoma (POAG) is associated with a change in volume of the visual pathway structures between the eyes and the visual cortex. METHODS To answer this question, magnetic resonance imaging (MRI) was used in combination with automated segmentation and voxel-based morphometry (VBM). Eight patients with POAG and 12 age-matched control subjects partic...

PURPOSE To review the intracranial and facial imaging features in children with congenital anophthalmos. METHODS We retrospectively studied eight children with anophthalmos with respect to intraorbital, intracranial, and craniofacial anomalies (six had CT examinations, including the face, orbits, and brain, and four had MR imaging, including the orbits and brain). RESULTS Three patients had...