In the course of nasal sinus and middle ear infections, supervening signs of focal cerebral involvement are usually indicative of brain abscess.53, 25,93,5 There are, however, certain instances when brain abscess is strongly suspected because of signs of focal cerebral involvement but is not found on surgical exploration or demonstrated by contrast roentgenography, and, the clinical course reverses toward recovery.Adson! believed that, in this type of case, the infection extended into the brain but resolved without suppuration. He called the condition pseudo-brain abscess. Others have referred to it as acute non-suppurative encephalitis, or local non-suppurative meningitis.": 87Our interest in this problem was aroused by three patients (Cases Nos. 3,4 and 5) who presented themselves within a single year. They were remarkably alike in that they developed, in the course of paranasal sinus infection, focal seizures, hemiparesis and signs of meningeal irritation. They were strongly suspected of having abscess but appropriate investigation ruled otherwise, and, they recovered without the necessity of intracranial exploration. We can only speculate on the cause of the neurological signs.