BOBBLE-HEAD DOLL SYNDROME-ASSOCIATED WITH SUBDUROPERITONEAL SHUNT MALFUNCTION

Bobble-head doll syndrome is known to be associated with aqueductal st enosis or cystic lesions of the III ventricle. The direction of moveme nt is usually vertical. In the literature, only five cases of purely h orizontal movement have been reported. Bobble-head doll syndrome manif ested as a sign of shunt malfunction has been described in one case wi th a ventriculoperitoneal shunt. The authors report on a 10-year-old b oy who showed subduroperitoneal shunt malfunction associated with hori zontal bobble-head doll syndrome. The head bobbing disappeared immedia tely after shunt revision. Unlike the previously reported cases, in th e present case the lesion was asymmetric, though the significance of t his for the lateral movement is not clear. This case also showed more marked ventricular dilatation on subduroperitoneal shunt malfunction t han in the pre-shunt state, The underlying mechanism of the ventricula r dilatation is unknown.