Paranasal Sinuses Anatomy & Postioning Ch 13
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| What is an older term for the Maxillary Sinuses? | show 🗑
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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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| show | 6 years
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| show | The Lateral Masses, or Labyrinth.
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| What is the drainage pathway for the paranasal sinuses called? | show 🗑
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| show | The Sphenoid Sinus
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| show | Infundibulum
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| Which position is most often used when performing a CT study of the sinuses? Do most CT studies of the sinuses require contrast media? | show 🗑
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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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| Are ultrasound exams of the maxillary sinuses possible to rule out sinusitis? | show 🗑
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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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| show | Lateral, PA Caldwell (OML perpendicular to IR), PA Water's-ParietoAcanthial (MML perpendicular to IR,/OML at 37 degree angle to IR), SMV (IOML parallel to IR).
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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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| Which projection are the Maxillary sinuses best demonstrated? What is brought out of the way? What is the alternate of this method? What does this alternate projection get out of the way of the sphenoid sinus on the radiograph? | show 🗑
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| show | A horizontal beam
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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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| show | OML will form a 37 degree angle. The MML will be perpendicular to the IR. The chin & nose will be against the Bucky/IR.
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| Where are the Petrous Ridges located on a well positioned PA-Water's-ParietoAcanthial Projection of the sinuses? | show 🗑
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| show | The head was not extended at the neck enough (the chin was not up high enough) if the petrous bone is in the maxillary sinus. The head was extended too much (the chin was up to high) if the roots of the teeth are in the maxillary sinus.
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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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| Where should the CR exit for the PA-Water's-ParietoAcanthial Projection & the PA-Open Mouth Water's-Transoral Projection? | show 🗑
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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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| show | There are generally 2 frontal sinuses. There is not always 2. The frontal sinuses are separated by a septum & if there's no septum, there's only 1 frontal sinus.
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| What is the appearance of chronic sinusitis? | show 🗑
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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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| Where is the CR centered for the lateral sinuses? | show 🗑
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