Seroma vs CSF

So I am 4 weeks post surgery now, I still have my ups and downs and I still take a few naps a day. A couple of days ago I had a CT scan, because I have increased headaches since the accident we had 2 weeks post op. I also feel like my heart is racing, and overall I feel like I took a step back during the healing process. The CT scan result said it is a 4.3 cm transverse x 3 cm AP and 4.5 cm in length fluid collection of the neck in the mid line. The report says it could me a Seroma or a CSF leak. I am waiting for the NS to call. Does anybody have experience with this?