case_images: PMC6417302_01
case_images: (a) Presence of air at the level of the cerebellum, and interpeduncular and crural cisternsa and (b) Partial disruption of the posterior mastoid cells with left mastoid occupation, associated with a retrosigmoid bone defect
case_images: AJNS-14-310-g001.jpg
case_images: PMC6417302_01_AJNS-14-310-g001.jpg
case_images: F1
case_images: In addition, cranial computerized axial tomography (CT) showed evidence of postoperative changes from the left retrosigmoid craniectomy, which consisted on the presence of retromastoid collection and pneumocephalus [Figure 1].
case_images: Nuclear magnetic resonance cisternography with intrathecal gadolinium injection through umbar puncture: The left retromastoid continuity solution is seen with the mastoid cavity, which appears occupied by contrast material, extending from the eustachian tube to the nasopharynx, which confirms paradoxical leak
case_images: AJNS-14-310-g002.jpg
case_images: PMC6417302_01_AJNS-14-310-g002.jpg
case_images: F2
case_images: It confirmed the presence of paradoxical CSF rhinorrhea [Figure 2].