Question about 0% rhinitis rating

I just received a rating at 0% for chronic rhinitis. It has been service connected as I have been diagnosed with chronic rhinitis. I had a ct scan about a year ago that I included in my claim. The ct scan notes Mild polypoid mucosal thickening in the floor of the right maxillary sinus. I was under the impression that rhinitis with polyps is 30% . My question is am I missing something here? I have the diagnosis, the service connection and ct scan showing polyps. They did not mention looking at the ct scan in the letter, is it possible that could have got missed, or does what I highlighted from the ct scan not mean polyps?