Complete opacification of sphenoid sinus on left, mucosal thickening on right. Tiny focal polypoid muosal thickening in floor of left maxillary sinus.
Adenoidal hypertrophy with moderate narrowing of nasopharynx and pharyngeal tonsillar hypertrophy with severe narrowing of oropharynx (not shown in entirety).
Thickened nasal conchae, left concha bullosa.
Large fluid-density right frontotemporal structure, probably a huge arachnoid cyst.
NB: The study was uploaded with a higher contrast than the original "sinus" (i.e. "internal acoustic canal") window to better display the intracranial structure.