A 5-month-old infant presented with cleft palate, febrile urinary tract infection and abnormal movements. His urinary stream was poor and investigations revealed posterior urethral valve and grade V vesicoureteric reflux. This baby was investigated for seizure activity and on MRI of the brain was found to have a large arachnoid cyst, splaying the occipital horns and compressing the posterior aspect of third ventricle leading to dilatation of the ventricles.
This seems to be a very unusual coexistence of three abnormalities in one patient for which no plausible explanation can be given. It appears to be a chance finding.