[Paralysis of the 3d cranial nerve caused by a megadolicho-basilar artery]

The authors report on one patient with palsy of left third cranial nerve. An angiographic study and C.T. show a megadolicho-basilar and an ectasia of the left middle cerebral artery in its M1 tract. The patient had a positivity of the T.P.H.A. test without clinic evidence of the syphilis in the anamnesis. In the discussion the authors, then, explain the elements that support the hypothesis of the pathogenic correlation between the luetic infection and the morphological arterial alterations of the patient. At last the authors summarize the clinical signs than more frequently had been found in the cases of megadolicho-basilar described in the literature.