NEUROLOGIC COMPLICATIONS OF INFECTIONS OF TEMPORAL BONE AND PARANASAL SINUSES: SUMMARY OF TWENTY YEARS' (1919 TO 1938) EXPERIENCE

NONSUPPURATIVE ENCEPHALITIS  Oppenheim³⁹ in 1900 and Voss⁴⁰ in 1902 described cases of nonpurulent encephalitis associated with aural infections. They stated the belief that the condition represents a stage in the development of a true abscess but that the encephalitis has failed to progress to suppuration. Borries⁴¹ in 1921 expressed the belief that otogenic encephalitis is a pathologically different process from that form of encephalitis which leads to the formation of abscess. Adson⁴² in 1924 described cases in which symptoms and signs of an abscess of the brain were present but on exploration only an accumulation of fluid in the subarachnoid space and congestion of cerebral convolution appeared. He attributed the clinical picture to localized encephalitis and termed it "pseudobrain abscess." Yerger⁴³ in 1925 and Symonds⁴⁴ in 1927 described cases in which evidences of increased intracranial pressure and focal disease of the brain associated with disease of the temporal bone and