“…Hobbs (1963) found that 0-0700 of patients admitted to an 'open psychoneurotic' ward and 6.30% to a 'mental hospital' had intracranial tumours. Others have found the incidence of intracranial tumours to range from 0.0500 (Olin and Weisman, 1964) to 0.20% (Rubert and Remington, 1963), the incidence of subdural haematomas in a neuropsychiatric hospital to be 0.18% (Pihkanen and Vauhkonen, 1967), and the incidence of the full range of neurosurgical disease in a mental observation unit to be 0.500 (Gooddy et al, 1960).…”