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 Indian J Med Microbiol  
 

Figure 4 (A-D): Trapped fourth ventricle in two different patients (A and B) and (C and D). (A and B) are three-dimensional sampling perfection with application optimized contrast using different flip angle evolution (3D SPACE) sagittal and coronal sections of a patient showing obstruction at the level of aqueduct and Foramen of Magendie (arrows). Upper arrow in (A) shows aqueductal membrane. Also note the gross dilatation of lateral and third ventricle. (C and D) are 3D SPACE sagittal and coronal sections of another patient showing trapped fourth ventricle, (arrows) showing fourth ventricular outlet obstruction

Figure 4 (A-D): Trapped fourth ventricle in two different patients (A and B) and (C and D). (A and B) are three-dimensional sampling perfection with application optimized contrast using different flip angle evolution (3D SPACE) sagittal and coronal sections of a patient showing obstruction at the level of aqueduct and Foramen of Magendie (arrows). Upper arrow in (A) shows aqueductal membrane. Also note the gross dilatation of lateral and third ventricle. (C and D) are 3D SPACE sagittal and coronal sections of another patient showing trapped fourth ventricle, (arrows) showing fourth ventricular outlet obstruction