Air- fluid level= acute sinusitis

= chronic sinusitis

Retention cyst

Submucosal accumulation of serous fluid.Smooth domed shaped structure.

Usually seen at the inferior aspect of the maxillary sinus and cannot differentiated from the polyp.

Sinonasal polyposis

Antro choanal polyp

Antro choanal polyp

Maxillary mucocele

Fronto-ethmoidal mucocele

Fungal sinusitis

Fungal sinusitis with intra-cranial extension

Osteoma

A large Inverted papilloma

Nasopharyngeal Angiofibroma

Left maxillary Carcinoma with nasal extension.