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There are several complications associated with immunization with the pentavalent vaccine. Most of them are mild reactions, of spontaneous resolution; however, though rare, serious and potentially-fatal adverse effects can occur. We report a case of acute intracranial hypertension syndrome in an infant with a previously-unknown suprasellar arachnoid cyst who developed acute obstructive hydrocephalus after immunization with the pentavalent vaccine. He underwent neuroendoscopic treatment, showing complete resolution of the condition. The present article aims to compare the activation of the immune system by the pertussis component of the vaccine and the mechanisms that hypothetically potentiated the pathological decompensation.

Context: Eagle syndrome is characterized by the elongation or disfiguration of the styloid process, which leads to a range of clinical manifestations resulting from the structures that are affected by the prolongation of the bone, and the classic presentation is composed of pain and foreign body sensation in the throat, otalgia, and dysphagia. Case report: We describe the case of a 60-year-old man with an ischemic stroke due to dissection of the left internal carotid artery, associated with compression resulting from Eagle syndrome. At clinical presentation, the patient presented right hemiparesis and severe dysphagia, with NIH=18, characterizing the stroke. An angiotomography of the skull and brain was performed, which showed an image compatible with dissection of the left internal carotid artery from the prolongation of the styloid process, characterizing Eagle syndrome stylocarotid syndrome. The patient was submitted to thrombolysis with rt-PA, presenting a partial response, and surgical bone reduction. Patient evolved with partial recovery, with NIH=10, and, at the time of discharge, presented RANKIN 1, symptoms without disabilities. Conclusion: The Eagle syndrome, while it occurs more frequently in women, in general, with the classic presentation, can evolve with a more severe picture, associated with vessel dissection and brain involvement.