SUMMARYThirteen young patients with DST are presented. The average age was 31.3 years. Seven patients presented with severe headaches. Six patients appeared to have no apparent cause for their thromboses while predisposing factors (polycythaemia, malignancy, posttrauma), were present in three. One patient was in her 1st trimester of pregnancy. Four patients had DVT while 2 of these patients also had pulmonary embolism. There was one death. Six patients had full recovery and six had mild residual hemiparesis. The prognosis is therefore good in this group of young patients with DST. Treatment should be directed at the primary cause. Where no cause can be found, treatment is aimed at the presenting symptoms.The role of CT is stressed. The presence of abnormal areas of hemorrhage or infarctions especially if they are parasagittal and/or bilateral should alert the radiologist to the diagnosis of DST. The empty delta sign, the cord sign, the dense vein sign as well as the presence of transcerebral medullary veins are highly specific. CT is therefore not only noninvasive but highly accurate and is the imaging procedure of choice. There is no need for angiography except in a selected few and CT has already replaced angiography. The role of MRI needs to be studied. It is entirely noninvasive and may when it becomes freely available, replace CT. So far, only three cases have been reported in the English literature. Signal void is a characteristic of flowing blood and a throm‐bosed venous channel will show a shortening of the T1 signals. In addition, the paramagnetic properties of deoxyhaemoglobin and methaemoglobin may allow determination of the age of the thrombus (Macchiet al1986). However, at the present state of the art, CT remains the first radiological screening procedure (Braunet al1985