This is the results of recent cat scan. what does it mean? There is mucosal thickening at the maxillary sinuses bilaterally with possible small polyp or mucous retention cyst on the left. Mucosal thickening is noted at the ethmoid air cells. There is an apparent mucous retention cyst or polyp apparently at a portion of the right sphenoid sinus anterolaterally near the posterior ethmoids. Mild mucosal thickening at the right sphenoid sinus. Mild to moderate leftward nasal septal deviation is noted. There is apparent partial concha bullosa of the right middle turbinate.