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Maxillary sinus mucociliary drainage flows through the sinus ostium into the infundibulum which joins the hiatus semilunaris and drains into the middle meatus. Acute sinus disease may be associated with air-fluid levels which if present commonly occur in the maxillary sinuses.
Axial image showing mucosal thicknening and an air-fluid level in the maxillary sinus (MS).
Coronal image with (*) showing obstruction of the infundibulum and on left side involvement of the hiatus semilunaris.
Coronal image demonstrating more extensive pattern of anterior ostiomeatal unit sinus disease with short arrow pointing to frontal recess, long arrow pointing to maxillary sinus ostium and infundibulum region with arrowheads marking the area of the hiatus semilunaris and middle meatus. Coronal image with small arrows illustrating involvement of the maxillary sinus ostium and infundibulum and large arrow pointing to maxillary sinus mucosal thickening.
Sagittal image with small arrowhead pointing to frontal sinus ostium, short arrows showing frontal sinus drainage involvement and large arrowhead showing involvement of hitus semilunaris again demonstrating anterior ostiomeatal pattern of disease.
Axial image demonstrating additional case of acute sinusitis with arrows pointing to air-fluid levels in the ethmoid and sphenoid sinuses. Axial image demonstrating air-fluid level in left maxillary sinus with arrow pointing to bony erosion of the posterior maxillary sinus wall in a case of acute sinusitis.

Axial image in soft tissue window with arrow pointing to posterior extension of sinus disease through the posterior maxillary sinus wall into the retroantral fat pad.
Axial image demonstrates an antrochoanal polyp that completely fills the maxillary sinus with arrow pointing to widened infundibular region with extension into the middle meatus and nasal cavity. The materials contained in this web site are protected by Copyright Law and The Digital Millennium Act of 1998 and intended for informative and educational purposes only. Send Home Our method Usage examples Index Contact StatisticsWe do not evaluate or guarantee the accuracy of any content in this site. Lorem ipsum dolor sit amet, consectetur elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
The middle meatus is also the final drainage for the frontal and anterior ethmoid sinuses. However, it is important to remember that many patients with acute sinusitis will not have air-fluid levels. Small arrows also demonstrate sinus disease of the anterior ethmoid air cells and larger arrows point to bilateral maxillary sinus mucosal thickening. Note the right maxillary sinus mucus retention cyst and paradoxical curvature of right middle turbinate.

Notice how sinus air partially surrounds the MRC in contrast to a mucocele which completely fills and expands the sinus. Often on imaging a polyp and mucus retention cyst cannot be differentiated, but is usually of little clinical consequence. Note the lucency and scallope edges.Mucosal thickening of left frontal sinus with air-fluid level in a patient with sinusitis.
The informations should not be used as a substitute for professional medical advice of your physician.
The anterior ostiomeatal unit comprises the frontal sinus ostium, frontal recess, maxillary sinus ostium infundibulum and middle meatus. Google Ads of this Website or Dr Rahmat Omar, MS [ORL-HNS] do not endorse, recommend, referrer to or are responsible for the advertisements or for the content or claims made in the advertisements. Therefore, a relatively common pattern of inflammatory sinus disease involves the anterior ostiomeatal unit.

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22.04.2016 admin

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