Abstract
Two cats, 1.5 and 2 months of age, showing central nervous system (CNS) signs with ataxia had transient improvement by treating and subsequent recurrence of the signs. Hydrocephalus was revealed by ventriculography, and ventriculoperitoneal shunt was made. In one case with two operations before reachig adultfood, no CNS signs could be seen following the final surgery but there was drainage tube obstruction 5 years later. The other case had no CNS sign for one year and five months after operation, although the distal end of drainage tube was dislocated in to subcutaneous tissue of the dorsal chest.
