ABSTRACT
The authors use case studies to illustrate the respective benefits of CT and MR imaging in the management of sphenoid sinus disease. Because the sphenoid sinus is located deep in the skull base adjacent to vital neurological and vascular structures, surgery involves a certain risk. The improved quality of imaging now available provides essential information on which to base therapeutic options. Since CT and MR findings make it possible to increase the precision of the pretherapeutic evaluation and to determine neurological and vascular involvement, these imaging studies have become an integral part of the successful management of sphenoid sinus disease.
Subject(s)
Magnetic Resonance Imaging , Paranasal Sinus Diseases/diagnosis , Sphenoid Sinus , Tomography, X-Ray Computed , Evaluation Studies as Topic , Humans , Paranasal Sinus Diseases/diagnostic imagingABSTRACT
The authors use case studies to illustrate the respective benefits of CT and MR imaging in the management of sphenoid sinus disease. Because the sphenoid sinus is located deep in the skull base adjacent to vital neurological and vascular structures, surgery involves a certain risk. The improved quality of imaging now available provides essential information on which to base therapeutic options. Since CT and MR findings make it possible to increase the precision of the pretherapeutic evaluation and to determine neurological and vascular involvement, these imaging studies have become an integral part of the successful management of sphenoid sinus disease.
Subject(s)
Magnetic Resonance Imaging , Paranasal Sinus Diseases/diagnosis , Sphenoid Sinusitis/diagnosis , Aspergillosis/diagnosis , Humans , Mucocele/diagnosis , Sphenoid Sinusitis/therapy , Tomography, X-Ray ComputedABSTRACT
This study compared the results of the CT scan of the paranasal sinuses in nasal polyposis patients before and after a topical vasoconstrictor application on the nasal mucosa. No change have been observed either on the maxillary and ethmoidal sinuses, or the middle meatus. On the other hand, an important retraction was observed on the nasal mucosa, in particular on the inferior turbinate. Then, the application of a topical vasoconstrictor on the nasal mucosa does not seem necessary in order to explore the sinuses in patients with nasal polyposis.
Subject(s)
Nasal Decongestants , Nasal Polyps/diagnostic imaging , Paranasal Sinus Neoplasms/diagnostic imaging , Polyps/diagnostic imaging , Tomography, X-Ray Computed , Adult , Aged , Clinical Protocols , Female , Humans , Male , Middle AgedABSTRACT
Twelve patients with nasal polyposis were examined with magnetic resonance imaging (MRI) prior to surgical ethmoidectomies (20 ethmoidectomies). MRI signal was analyzed in correlation with surgical findings in order to define the semiology of nasal and sinuses polyps. One of the most important point of this semiology is based on the analysis of sequences after administration of gadolinium. MRI seems an interesting method for analysing the extension of nasal polyposis and could be useful for ENT surgeons before an endoscopic nasal surgery.
Subject(s)
Magnetic Resonance Imaging , Nasal Polyps/diagnosis , Paranasal Sinus Neoplasms/diagnosis , Polyps/diagnosis , Adolescent , Adult , Aged , Echo-Planar Imaging , Ethmoid Bone/surgery , Ethmoid Sinus , Female , Gadolinium , Humans , Male , Middle Aged , Nasal Polyps/surgery , Paranasal Sinus Neoplasms/surgery , Polyps/surgeryABSTRACT
The internal architecture of the parotid gland was studied by nuclear magnetic resonance (NMR) imaging, particular attention being paid to the intra-parotid portion of the facial nerve. Currently available apparatuses provide high resolution images of previously poorly elucidated anatomic details. Certain authors consider that images in the axial plane in T1 allow direct visualization of the facial nerve and its branches in the form of low frequency linear signals within the gland. The present study, based on radio-anatomic correlations and date determined in a healthy volunteer, demonstrated that these structures correspond in fact to segments of the excretory canal tree, the facial nerve and its branches being invisible on NMR imaging. It is not possible, therefore, to determine the location of a parotid tumor in relation to these nerve elements using this imaging technique.
