Paranasal Sinuses Anatomy & Postioning Ch 13
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| show | Antrum of Highmore
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| An infection of the teeth may travel upward & involve which sinus? | show 🗑
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| Specifically, where are the frontal sinuses located? | show 🗑
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| The frontal sinuses rarely become aerated before which age? | show 🗑
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| Which specific aspect of the Ethmoid bone contains the Ethmoid Sinus? | show 🗑
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| What is the drainage pathway for the paranasal sinuses called? | show 🗑
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| Which sinus will be projected through the open mouth with a PA axial transoral projection? | show 🗑
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| What is the name of the passageway between the Maxillary Sinuses & the middle nasal meatus? | show 🗑
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| show | Prone is the most often used body position for CT scans of the sinuses. Most CT scan studies of the sinuses do not require contrast media.
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| show | 65-80 kV. A little less than skull radiography.
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| show | Use of a horizontal x-ray beam. To perform exams erect whenever possible.
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| show | Yes
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| What imaging modality is the preferred method to study soft tissue changes & masses within the sinuses? | show 🗑
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| What are the 4 most commonly performed basic, or routine projections for paranasal sinuses? | show 🗑
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| show | The lateral.
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| show | The lateral projection
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| show | The lateral projection.
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| show | The PA-Water's-ParietoAcanthial Projection. The nasal cavity is brought out of the way. The Open Mouth Water's. The sphenoid sinus is free of bony & soft tissue (tongue) superimposition.
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| If the patient cannot stand for the lateral projection of the paranasal sinuses, it should still be taken with what? | show 🗑
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| What sinuses are best demonstrated with the PA Caldwell projection? | show 🗑
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| To avoid angling the CR for the erect PA Caldwell Sinus Projection, the head should be adjusted so the OML is how many degrees from horizontal? | show 🗑
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| How many degrees does the OML form with the IR for PA Waters Sinus projection? Which positioning line is perpendicular to the IR? What 2 portions of the patient's face are on the IR? | show 🗑
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| show | Just below the maxillary sinuses.
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| If the Petrous bone is in the Maxillary sinus, what is the positioning error? If the roots of the teeth are in the maxillary sinus, what is the positioning error? | show 🗑
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| show | The SMV projection is primarily for demonstrating the Sphenoid Sinus, but also for the Ethmoid & Maxillary sinuses.
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| show | Through the Acanthion.
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| Where are the Sphenoid SInuses located? | show 🗑
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| show | A basal skull fracture. Because the sphenoid sinuses are close to the base of the floor of the cranium.
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| What are the 3 collections the Ethmoid sinuses are grouped into? Do they all intercommunicate? | show 🗑
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| How many Frontal sinuses are there? Is there always this many? If not, why? | show 🗑
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| show | Conic Sinusitis, mucous membrane of the sinuses are swollen & not necessarily full of fluid.
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| What is the appearance of acute sinusitis? Why is this? | show 🗑
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| A quadripalegic patient with chronic sinusitis presents for a sinus study & cannot be placed erect. Which single projection will demonstrate any possible air fluid levels in the sinuses? | show 🗑
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| show | The OML will be 15 degrees from the IR. The patient's nose & forehead will be against the bucky. The CR should exit at the Nasion. The bucky can be tilted 15 degrees towards the floor, with the CR still perpendicular.
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| show | The CR should be centered midway between the outer canthus & the EAM for lateral sinuses.
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