[Some examples of false negative diagnoses in computer tomography (author's transl)]

Four examples of false negative diagnoses in computer tomography are discussed. The patients were suffering from tumours in the sella turcica, beside the sella turcica and in the cerebellopontine angle. With reference to the two patients with a process beside the sella turcica, the differential diagnosis of these processes (of which the clinical syndrome is characterized by ophthalmoplegia) is discussed. The diagnostic reliability of computer tomography seems to be inferior for these perisellar processes than for other localizations. Angiography and pneumoencephalography are the methods of choice in the diagnosis of these processes.