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Radiology of Nasal Cavity and Paranasal Sinuses PowerPoint Presentation

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Description : Check out this medical presentation on Ear, Nose, and Throat Facts, which is titled "Radiology of Nasal Cavity and Paranasal Sinuses", to know about the Radiology of Nasal Cavity and Paranasal Sinuses.

Tags : Ear, Nose, Throat Facts, Radiology, Nasal Cavity, Paranasal Sinuses

Published on : Jul 10, 2021 | Views : 2917 | Downloads : 4

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Slide 1-

Radiology of Nasal Cavity and Paranasal Sinuses
Slide 2-

Radiology XRAY CT MRI
Slide 3-

Normal Anatomy
Slide 4-

Drainage system Lamella: 1) uncinate 2) ethmoidal bulla 3) basal lamella 4) superior turb lamella
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Uncinate attachment variations
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Agger Nasi
Slide 8-

Frontal sinus outflow tract May be narrowed by agger anteriorly or bulla posteriorly Frontal cells (Type 1-4) Frontal recess Lateral: lamina papyracea Medial: middle turbinate Anterior: posterior wall of agger nasi Posterior: ethmoid bulla
Slide 9-

Basal lamella U B L
Slide 10-

Keros Classification
Slide 11-

Sphenoid sinus
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Haller cells
Slide 13-

Other anatomic variations Concha bullosa Septal deviations Paradoxic middle turbinate convex curvature on the lateral, rather than medial side of the turbinate Dehiscent lamina Aerated crista galli Optic nerve/carotid artery
Slide 14-

MRI Helpful for evaluation of regional and intracranial complications Detection and staging of neoplastic processes Improved display between intraorbital and extraorbital compartments Helpful for diagnosing fungal concretions which show low or no signal on T2 Helps for evaluation of mucoceles and cephaloceles Appearance varies with changing concentrations of proteins and free water protons T2  more “watery”, higher signal T1  more protein, higher signal However, once protein content reaches too high signal decreases
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Slide 17-

Epistaxis
Slide 18-

Epistaxis Most common otolaryngologic emergency Majority idiopathic 60% of population in their lifetime Maxillary sinus ostium serves as dividing line between “anterior” and “posterior bleeds”
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Vascular anatomy
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Endoscopic SPA ligation Epistaxis controlled in 98% Locate SPA at level of crista ethmoidalis Key in surgery is to ligate all branches which can vary
Slide 22-

Embolization Risk of complications: CVA, hemiplegia, ophthalmoplegia, facial nerve palsy, seizures, soft tissue necrosis Effective only for ECA supply very dangerous for ICA supply due to high risk of blindness Success rate 71-95% Complication rate 27%
Slide 23-

Anterior ethmoid artery bleeding Associated with nasoethmoid fractures Bleeding rarely subsides with conservative measures Variable position Always seen between second and third lamellae Most common site in the suprabullar recess (85%)