[Cerebellar infarction presenting erotic delusion and delusion of jealousy in the acute phase].

A 62-year-old female presented peduncular hallucinosis accompanied with outstanding manifestation of delusion of jealousy and erotic delusion in the acute phase of cerebellar infarction. The delusion seemed to appear as the swollen cerebellum was compressing the tegmentum of brainstem. CT scanning revealed the sequential images of the compression by the swollen cerebellum and deformity of the brainstem and their final recovery. The reason why the patient showed the outstanding delusion that is unusual in the ordinary peduncular hallucinosis is unclear. It might be brought about by the acute hydrocephalus induced by the occlusion of aqueduct.