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<p>Differentiating sinonasal cysts and cyst-like entities<br>Major Lisa Franklin, DC, USA, Lieutenant Commander Brenda Nelson, DC, USN, and Commander James T. Castle, DC, USN<br><br>Introduction<br>Subtle variations of oral and craniofacial anatomy are commonly identified and documented as part of routine dental examinations and radiographs. One such common finding is the dome-shaped radiopaque shadow seen arising from the floor of the maxillary sinus, termed the antral pseudocyst. In the past, this entity has been inaccurately referred to as a sinus mucocele because previous investigators thought that the lesion represented mucus extravasation similar to that seen in association with the minor salivary glands of the oral mucosa. True sinus mucoceles, a potentially aggressive lesion, do exist and occur under several circumstances. Another point of confusion is the sinus retention cyst, an entity of little clinical significance found in individuals with nasal polyps. While these entities may, unfortunately, share similar nomenclature, they differ in etiology, presentation and treatment. An understanding of their terminology and clinical consequences is essential to patient treatment and outcome.
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<br>Subjects: Cysts; Maxillary Sinus; Nasal Polyps; Paranasal Sinus Diseases;  Paranasal Sinuses</div>
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U.S. Navy. Naval Postgraduate Dental School</div>
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