Sarcoidosis is defined by Scadding (1967) as “a disease which is characterized by the presence in all of several affected organs or tissues of epithelioid cell tubercles … proceeding either to resolution or to … (the formation of) fibrous tissue”. The organs which are most commonly involved are the lungs, skin, eyes, liver, spleen and joints. Clinical evidence of involvement of the central nervous system may be found in 5 per cent of all cases (Silverstein et al, 1965; Wiederholt and Siekert, 1965; Delaney, 1977). Typical lesions are cranial nerve palsies, intracranial space-occupying lesions, pituitary or hypothalamic lesions and, less frequently, lesions of the brainstem or spinal cord (Waldenstrom, 1937; Matthews, 1965; Wiederholt and Siekert, 1965; Scadding, 1967; Delaney, 1977).