Male, 48 years old, with right lower extremity weakness and spasticity. Postsurgical changes from a right temporal craniotomy are seen. There is a fluid-filled cavity involving the right inferior and middle temporal gyri with minimal surrounding T2 hyperintensity and no associated edema. A slitlike extension of this cavity extends upward into the external capsule. Nodular and streaky areas of susceptibility are seen within or around the cavity likely representing chronic hemosiderin staining.Elsewhere in the brain, no significant parenchymal signal abnormality is seen. Diffusion-weighted images are within normal limits. No evidence of edema or mass effect is detected. No findings to suggest acute intracranial hemorrhage are noted. The ventricular system is within normal limits allowing for some mild ex vacuo dilatation of the right atrium and temporal horn. There may be mild crowding of structures at the level of the foramen magnum, though this is equivocal and can be artifactual or exaggerated by positioning.Marrow signal characteristics are within normal limits except for postoperative changes as above. Mucosal thickening or a mucous retention cyst is seen within the right maxillary sinus.
1.Sequelae of right temporal craniotomy with a resection cavity and/or encephalomalacia involving the right middle and inferior temporal gyri.2.Elsewhere no significant brain parenchymal signal abnormality is seen. No acute intracranial process is suspected.