Computed Tomography of the Ethmoid Sinuses

1985 ◽  
Vol 18 (1) ◽  
pp. 29-42 ◽  
Author(s):  
Donald W. Chakeres
Keyword(s):  
Computed Tomography ◽  
Ethmoid Sinuses

Relationship of the Optic Nerve to the Paranasal Sinuses as Shown by Computed Tomography

1987 ◽  
Vol 96 (4) ◽  
pp. 331-335 ◽  
Author(s):  
Stephen F. Bansberg ◽  
Stephen G. Harner ◽  
Glenn Forbes
Keyword(s):  
Computed Tomography ◽  
Optic Nerve ◽  
High Resolution ◽  
Sphenoid Sinus ◽  
Computed Tomographic ◽  
Sinus Cavity ◽  
Bony Plate ◽  
Ethmoid Sinuses ◽  
Relationship Of ◽  
Sphenoid Sinuses

Restricted exposure and inconsistencies in sinus pneumatization place the optic nerve at risk during operations on the sphenoid sinus and posterior ethmoid cells. In this study, computed tomography was used to examine these relationships. We reviewed 80 patients who underwent high-resolution computed tomographic scanning for ophthalmologic complaints in which the scan was negative. Forty-eight percent of posterior ethmoid cells are separated from the optic nerve by the thin bony lamina of the optic canal. Nearly 90% of sphenoid sinuses contact the ipsilateral optic nerve and 10% contact both nerves. Eight percent of posterior ethmoid cells override the ipsilateral sphenoid sinus and contact the optic nerve on that side. Paraxial reformatted displays allowed estimation of the degree of projection of the optic nerve into adjacent sinus cavities. Three percent of optic nerves have significant projection into the posterior ethmoid cell, and 23% project significantly into the sphenoid sinus. The width of the bony plate that separates the optic nerve from the sinus cavity was the same for sphenoid and ethmoid sinuses. Although sinus pneumatization varies among individuals, right and left sides are generally similar within one person.

Correlation between bacteriology and computed tomography staging for chronic sinusitis

2005 ◽  
Vol 119 (3) ◽  
pp. 193-197 ◽  
Author(s):  
Rong-San Jiang ◽  
Pzu-Kai Lin ◽  
Jen-Fu Lin
Keyword(s):  
Computed Tomography ◽  
Chronic Sinusitis ◽  
Sinus Surgery ◽  
Ct Scans ◽  
Middle Meatus ◽  
Ostiomeatal Complex ◽  
Highly Correlated ◽  
Endoscope Guidance ◽  
Ethmoid Sinuses ◽  
Maxillary Sinuses

In this study we report on the correlation between bacteriology and disease severity staging by computed tomography (CT) for chronic sinusitis. When patients with chronic sinusitis underwent functional endoscopic sinus surgery (FESS), swab specimens were taken from the ipsilateral middle meati and ethmoid sinuses under endoscope guidance. The severity of chronic sinusitis was evaluated by pre-operative CT scans. The CT scans were staged by the Lund and Mackay system. The scores for the frontal, anterior ethmoid and maxillary sinuses and for the ostiomeatal complex were added. The culture rates were correlated with the added scores. Between November 1998 and January 2003, 79 pairs of specimens were collected from 79 patients whose CT scans were done within a day before FESS. The culture rates of middle-meatus specimens were moderately correlated with the scores, but those of ethmoid sinus specimens were negatively correlated with the scores. If Staphylococcus epidermidis and corynebacteria were considered normal flora, the bacteriology of the middle meatus was highly correlated with the CT scores. This study shows that culture rates of middle-meatal specimens tended to increase with the severity of chronic sinusitis.

Neuroendocrine carcinoma of the ethmoid sinuses treated with radiotherapy alone

2012 ◽  
Vol 126 (10) ◽  
pp. 1066-1068 ◽  
Author(s):  
P W Flavahan ◽  
J Keir ◽  
V Srinivasan
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Case Report ◽  
Paranasal Sinus ◽  
Neuroendocrine Carcinoma ◽  
Resonance Imaging ◽  
Recurrent Epistaxis ◽  
Radiotherapy Alone ◽  
Ethmoid Sinuses ◽  
Viable Treatment

AbstractObjective:We present the first report of a case of neuroendocrine carcinoma of the paranasal sinuses treated successfully with radiotherapy alone.Method:A case report and literature review are presented.Results:Fewer than 50 cases of paranasal sinus neuroendocrine carcinoma have been reported. We present an 82-year-old man referred with recurrent epistaxis. He was investigated by biopsy, computed tomography and magnetic resonance imaging, and was found to have a rare neuroendocrine carcinoma. He declined any surgery or chemotherapy but consented to radiotherapy. Thirty months later, he remained clinically free from cancer.Conclusion:There is no consensus for the management of paranasal sinus neuroendocrine carcinoma. Most cases are treated with surgery with or without chemoradiotherapy. This case shows that radiotherapy alone may be a viable treatment option for some cases.

Evaluation of mucosal surface reduction after ethmoidal surgery in nasal polyposis

2007 ◽  
Vol 121 (7) ◽  
pp. 1-4 ◽  
Author(s):  
P Bonfils ◽  
P Avan ◽  
P Palimi ◽  
D Malinvaud
Keyword(s):  
Computed Tomography ◽  
Maxillary Antrum ◽  
Lateral Wall ◽  
Ethmoid Sinus ◽  
Mucosal Surface ◽  
Sinus Wall ◽  
Lateral Ethmoid ◽  
The Mean ◽  
Upper Level ◽  
Ethmoid Sinuses

Objectives: To assess the reduction of mucosal surface after total sphenoethmoidectomy.Study design: Prospective study.Methods: Twelve normal, consecutive computed tomography scans were used. Computed tomography measurements were made at two different levels: the cribriform plate, and the upper level of the maxillary antrum. The length of the lateral wall of the ethmoid sinus and the perimeter of each ethmoid cell were measured at each level and on each side. The whole perimeter of the ethmoid sinus was evaluated for each CT scan level. For each side and each level, the ratio between the ethmoid sinus perimeter and the lateral ethmoid wall length was calculated.Results: The mean length of the lateral ethmoid sinus wall was 61.7±1.3 mm and 59.9±1.6 mm at the upper and lower parts of the ethmoid sinus, respectively. The mean ethmoid sinus perimeter was 263.2±11.5 mm and 250.4±11.1 mm at the upper and lower parts of the ethmoid sinus, respectively. No significant statistical difference was observed between measurements as a function of side (right or left) or level (upper or lower). The mean ratio between the ethmoid sinus perimeter and the lateral ethmoid wall length was 4.2.Conclusion: After total sphenoethmoidectomy, the mucosal surface of the ethmoid sinuses is reduced by a factor of 4.2; about 76 per cent of the mucosa is removed during total sphenoethmoidectomy.

Abnormalities of the paranasal sinuses in patients with nasopharyngeal carcinoma: a computed tomographic study

1996 ◽  
Vol 110 (1) ◽  
pp. 23-26 ◽  
Author(s):  
M. J. Porter ◽  
H. S. Cheung ◽  
R. Ambrose ◽  
S. F. Leung ◽  
C. A. van Hasselt
Keyword(s):  
Computed Tomography ◽  
Hong Kong ◽  
Retrospective Study ◽  
Nasopharyngeal Carcinoma ◽  
Paranasal Sinuses ◽  
Ethmoid Sinus ◽  
Control Group ◽  
Computed Tomographic ◽  
Computed Tomography Scans ◽  
Ethmoid Sinuses

AbstractA retrospective study of computed tomography scans of the paranasal sinuses of 131 control subjects in Hong Kong revealed minor mucosal abnormalities in more than half of the ethmoid sinuses. Major abnormalities were present in seven per cent of maxillary, five per cent of anterior ethmoid and four per cent of posterior ethmoid sinus. In 85 patients with nasopharyngeal carcinoma the prevalence of minor mucosal abnormalities in the sinuses was similar to that of the control group but major mucosal abnormalities were significantly more common in the anterior and posterior ethmoids at 15 per cent and 21 per cent of the respective sinuses (p<0.001).

Craniofacial Ballpoint Pen Injury: Endoscopic Management

2000 ◽  
Vol 109 (2) ◽  
pp. 119-122 ◽  
Author(s):  
John R. LaFrentz ◽  
Eric A. Mair ◽  
John D. Casler
Keyword(s):  
Computed Tomography ◽  
Endoscopic Sinus Surgery ◽  
Sphenoid Sinus ◽  
Unusual Case ◽  
Case Reports ◽  
Sinus Surgery ◽  
Endoscopic Management ◽  
Foreign Body Extraction ◽  
Craniofacial Trauma ◽  
Ethmoid Sinuses

Penetrating facial injuries are not infrequent. There have been isolated case reports of unusual penetrating craniofacial trauma. We describe an unusual case of a 22-month-old child who suffered an external orbital injury from a ballpoint pen that penetrated the orbit, lamina papyracea, posterior ethmoid sinuses, and sphenoid sinus. Endoscopic sinus surgery was performed to extract the ballpoint pen nib after localization with computed tomography. Careful pediatric endoscopic sinus surgery techniques permitted safe foreign body extraction with minimal morbidity.

B-Mode ultrasonography of the paranasal sinuses compared with CT findings

1992 ◽  
Vol 107 (6_part_1) ◽  
pp. 713-720 ◽  
Author(s):  
Gerard J. Gianoli ◽  
Wolfgang J. Mann ◽  
Robert H. Miller
Keyword(s):  
Computed Tomography ◽  
Maxillary Sinus ◽  
Gold Standard ◽  
English Language ◽  
Prospective Trial ◽  
Ethmoid Sinus ◽  
English Language Literature ◽  
Ethmoid Sinuses ◽  
Retention Cysts ◽  
Language Literature

Ultrasound as a diagnostic aid In the evaluation of the sinuses has been a controversial Issue. Sensitivities have been reported from 29% to 100% and specificities from 55% to 99%. These wide variations in results from previous studies may have resulted from technical differences. However, the “gold standard” most often used for comparison has been a Water's view radiograph, which has been shown to correlate poorly with intraoperative and CT scan findings. To our knowledge, no one In the English language literature has evaluated sonography of the sinuses with computed tomography as the gold standard. In addition, evaluation of the ethmoid sinus has been neglected by previous studies that have primarily assessed the maxillary sinus. We report the results of a blinded, prospective trial comprised of 41 patients examined by B-mode ultrasound with comparison to computed tomography. Frontal and maxillary sinuses were examined with traditional sonographic techniques and the ethmoid sinuses were scanned with a transglobe technique not previously evaluated in the English language literature. Excluding Isolated mucous retention cysts and focal minimal mucosal thickening (defined as <4 mm), sensitivities for ultrasound of the maxillary, frontal, and ethmoid sinuses were 100% each. Specificities were 98% for the maxillary sinus, 100% for the frontal sinus, and 94% for the ethmoid sinus. Technical aspects and implications of this and previous reports will be discussed.

X-ray microtomography

1988 ◽  
Vol 46 ◽  
pp. 998-999
Author(s):  
H.W. Deckman ◽  
B.F. Flannery ◽  
J.H. Dunsmuir ◽  
K.D' Amico
Keyword(s):  
Computed Tomography ◽  
Internal Structure ◽  
Imaging Technique ◽  
Three Dimensional ◽  
Tissue Structure ◽  
Individual Element ◽  
X Ray ◽  
Non Invasive ◽  
Panoramic Imaging ◽  
Three Dimensional Images

We have developed a new X-ray microscope which produces complete three dimensional images of samples. The microscope operates by performing X-ray tomography with unprecedented resolution. Tomography is a non-invasive imaging technique that creates maps of the internal structure of samples from measurement of the attenuation of penetrating radiation. As conventionally practiced in medical Computed Tomography (CT), radiologists produce maps of bone and tissue structure in several planar sections that reveal features with 1mm resolution and 1% contrast. Microtomography extends the capability of CT in several ways. First, the resolution which approaches one micron, is one thousand times higher than that of the medical CT. Second, our approach acquires and analyses the data in a panoramic imaging format that directly produces three-dimensional maps in a series of contiguous stacked planes. Typical maps available today consist of three hundred planar sections each containing 512x512 pixels. Finally, and perhaps of most import scientifically, microtomography using a synchrotron X-ray source, allows us to generate maps of individual element.

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