PMC6417302_01
(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
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F1
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].
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
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F2
It confirmed the presence of paradoxical CSF rhinorrhea [Figure 2].