This patient had both a mucocele and an acquired encephalocele. He presented with blurred vision. The findings are:. First look at the images on the left. On the image on the left hypointense tissue is seen in the pterygo-palatine fossa and videan canal yellow arrow.
Imaging the paranasal sinuses is routine in clinical practice to evaluate for various sinus pathology, non-specific. If additional imaging is necessary, orbital MRI is the next step. The CT clearly shows the opacified sinus, which is slightly hyperdense.
CT of the paranasal sinuses SpringerLink
Published Online:Sep 19 recalled and incorporated into the preoperative imaging report through the use of the mnemonic “CLOSE”: Cribriform plate, Overview of Paranasal Sinus Anatomy.
The real value of unenhanced CT is the following: if you see an opacified sinus with hyperdense contents, it is usually a sign of benign disease.
Did you notice the bony defect on the left side, at the lateral border of the ethmoid air space yellow arrow?
The hypodensity reflects cysts, mucosal disease, and granulation tissue. Malignancies are rare. MRI nicely demonstrates how the meningioma spreads down into the sino-nasal cavity.
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Continue with the contrast enhanced images.
The Radiology Assistant Paranasal Sinuses MRI
There is hyperdense material in the posterior right ethmoid, the bilateral spheno-ethmoidal recesses, the sphenoid sinus and there is involvement of the clivus. Pre-treatment we see the extent of the lesion, which is FDG-avid. Malignant tumors of the sinonasal tract are extremely rare.
This information has made the imager an important member of the physician team that evaluates the operability and treatment planning of these patients. The naso-lacrimal sac connects with the duct, which then drains into the inferior meatus.
Urban and Schwartzenberg, Baltimore Google Scholar.
Neuroradiology/Head and Neck Imaging Analysis of every routine CT scan of the paranasal sinuses obtained for sinusitis or rhinitis for the presence . Variations in paranasal sinus anatomy: implications for the pathophysiology of chronic. The purpose of this essay is to present a systematic approach to the use of coronal, for CT evaluation of the sinuses before functional endoscopic sinus surger surgery: anatomy, variations, and imaging findings in inflammatory diseases.
To correctly interpret imaging studies, it is essential to understand the anatomy of the lateral nasal wall and its relationship to adjacent structures.
Paranasal sinuses Radiology Reference Article
See the article on Orbital Pathology by David Youssem for more information about orbital and periorbital cellulitis. The least common location is the maxillary sinus. On the left there is peri-orbital pre-septal soft tissue swelling. Loading Stack - 0 images remaining.
Notice the obstructing solid mass at the frontal ethmoidal junction yellow arrows. On the left you see a case that was initially interpreted as a tumor.
Imaging of the Nasal Cavity and Paranasal Sinuses Anatomy and Anatomic Variations SpringerLink
Many of the fibrous dysplasia lesions in the clivus, skull base or sino-nasal cavity and in children may have large cystic components, so don't let that dissuade you from the diagnosis! Louis Google Scholar.