We thank Drs. Mahajan and Gupta for their comment. Our data were based on a neuroanatomy text written by the head of the anatomy department of the Medical University of Vienna. 1 

However, we wish to stress that the main purpose of our case report is to discuss the clinical value of a longer period of cerebrospinal fluid drainage. The details of normal cerebrospinal fluid physiology are beyond the scope of our article.

Firbas W, Gruber H, Mayr R: Neuroanatomy, 2nd edition. Vienna, Austria, Maudrich, 1995, pp 25–6