PMC5217307_01
(a-i) Preoperative brain MRI (a-c). The white arrow (a; axial Flair sequence) points to the tumor invading the cerebellar parenchyma bilaterally. The lesion appears slightly hyperintense. The 4th ventricle is invaded (white arrowhead), causing a hydrocephalus (dilatation of the lateral ventricles in b). The tumor expands clearly in the vermis as shown on a sagittal image (c). Early postoperative axial FLAIR slice shows postoperative sequelae at the level of dentate nuclei bilaterally (white arrows in d). The hydrocephalus is resolved (e). The 4th ventricle is moderately dilated, including in the rostral direction. The superior medullary velum is visible (white arrow in f). The superior cerebellar peduncles are involved (white arrows in g), with a slight extension towards the corpora quadrigemina at the level of inferior colliculi (white arrows in h). Crus cerebri are spared bilaterally (white arrows in i). R: right side
40673_2016_59_Fig1_HTML.jpg
PMC5217307_01_40673_2016_59_Fig1_HTML.jpg
Fig1
MRI (Magnetic Resonance Imaging) of the brain showed a tumoral mass lesion in the fourth ventricle extending to the foramen magnum, invading the vermis and cerebellar parenchyma bilaterally and exerting mass effect on the tentorium, pons and cerebellum (Fig. 1a-c). However, postoperative sequelae included tissue damage at the level of both caudate nuclei, moderate dilation of the 4th ventricle, involvement of the cerebellar peduncles with a slight extension towards the corpora quadrigemina at the level of the inferior colliculi (Fig. 1d-i).