Isotopic cisternography using radioiodinated serum albumin (IHSA) introduced into the cerebrospinal fluid (CSF) was first described by DiChiro (1) in 1964. It is recognized as a valuable diagnostic tech nique, particularly in normal pressure hydrocephalus (2-4), CSF leaks (5), subarachnoidal blocks (6) and subdural hematoma (7).

In other reports and texts the normal pattern of CSF circulation has been described. This communication briefly presents a patient with an incomplete form of Sturge-Weber syndrome and an abnormal pattern of @SFcirculation. The possible mechanism and diagnostic applications are discussed.