[Magnetic resonance tomography of non-tumorous lesions of the pons].

The paper gives details of the diagnostic value of MRI in 20 cases of non-tumorous lesions of the pons. MR findings in haematoma (3), vascular malformations (2), infarctions (6), encephalitis (1), demyelinations (6) and atrophies (2) resulted in signal changes typical of the kind of disease. A pontine volume increase or decrease was proved comparing the data of the normal and affected brain stem. The topography of lesions was clearly documented by MRI. Subacute haematomas were better outlined than by CT, while acute infarctions, foci of demyelination and one case of ponsencephalitis were proved only by MRI. Small calcifications and vessels of an arteriovenous malformation, however, caused the same MR signal patterns.