A 3-year-old male was admitted to our hospital on March 02, 2010, mainly due to headache with nausea and vomiting for 7 days, 17 months after abdominal shunt for left temporal arachnoid cyst. The child had undergone a cystic abdominal shunt for a left temporal arachnoid cyst 17 months prior to admission and had recovered well after surgery. On January 15, 2010, he developed headache with no apparent cause, accompanied by nausea and vomiting several times. On February 23, 2010, the shunt was replaced under general anesthesia. After the operation, the child’s headache symptoms worsened and he came to our hospital for further treatment. The child recovered well after the operation and the incision sutures were removed 7 days after the operation. The child’s young age and small ventricle required a high degree of puncture accuracy. The following figure shows the comparison of the preoperative and postoperative CT findings. The best location is the anterior foot of the lateral ventricle as shown in the figure, where the choroid plexus is least distributed and the shunt is less likely to be blocked.