The EMI head scanner was used to review a large number of cases of porencephaly [in man]; computed tomographic scanning was the most satisfactory method of evaluating these lesions. The nuclide brain scan was not usually of significant value for diagnosis, and although angiography and pneumoencephalography were used for correlation in some cases, the CT [computed tomography] scan was often the only neuroradiological procedure necessary to achieve the correct diagnosis. Porencephalic areas usually had a well-defined border, had the density of CSF and did not change in density following the use of contrast medium enhancement.