<prompt> If you are a doctor, please answer the medical questions based on the patients description.I had transsphenoidal pituitary surgery almost 4 weeks ago. The day after surgery I developed CSF leak leaked through my nose. The put in a lumbar drain and I layed flat for seven days. After the 7 days there were no signs of the leak. I just developed a post nasal drip that taste salty. My Neurosurgeon said it is most likely sinus drain as well as fluid from the surgery since they inserted a sponge. Should I be concerned that the CSF leak has returned?  <response>: Hello, There is no need to panic about spinal fluid leaking as long as you have no other symptoms. Besides, it does not taste salty. A possible way to check it, would be analysed this fluid for the presence of glucose. If there is no glucose 0 mgDL, it is certain that it is nasal fluid or sinus fluid and there is nothing concerning. Hope I have answered your query. Let me know if I can assist you further. 