A Study of Normal Mri Measurements of Optic Chiasma and Its Correlation With Perichiasmal Lesions

Abstract

BACKGROUND Cranial MRI is routinely performed in which optic chiasma is visualised as part of optic pathways. Chiasma can be affected by various pathologies. Its deviation from normal dimensions can easily be calculated on routine cranial MRI. METHOD This study was done retrospectively evaluating twenty consecutive cranial MRI examinations. T2WI images were included in this study as it was a part of routine protocol and were used for evaluation. One case from another setup was included in this study to highlight the importance of measurements. RESULTS The normal and abnormal measurements were calculated with submillimetre digital caliper and are described in Table 1-2. The parameters used were width, height and area of optic chiasma. CONCLUSION This study highlights the usefulness of evaluating optic chiasma to diagnose various visual and nonvisual-related conditions. Objective measurements of optic chiasma should be done routinely in T2WI coronal images.