The formation of an atrial bout of diverticulitis secondary to hydrocephalus due to colloid cyst of the third ventricle has not been described. In these 3 patients, CT and MRI examinations showed findings characteristic of colloid cysts of the third ventricle with hydrocephalus of lateral ventricles and formation of unilateral atrial diverticula.
The diverticula subsided when cerebrospinal fluid pressure fell after ventricular drainage. The formation of atrial diverticula in these cases was probably facilitated by the fact that hydrocephalus of lateral ventricles was not accompanied by an
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