elaborated with the help of the Keros classification. classification was used for the measurement of the depth of the olfactory fossa as follows. To determine the Keros classification and asymmetrical distribution rates of the ethmoid roof and the frequency of anatomic variations of the paranasal sinuses. Acta Otolaryngol. Feb;(2) doi: / Epub Sep 9. Is the Keros classification alone enough to identify.

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Keros classified the depth of the olfactory fossa into 3 types based on the height of the lateral lamella [ 5 ].

Measurements were performed using the distance measurement technique in the coronal plane. This result may be because our study was conducted using a larger sample and because measurements were performed digitally.

Radiology info hub: Keros Classification

The mean height of the right side of the ethmoid roof was 4. Support Center Support Center. Only one patient was found with Keros type III anatomical variation, with the greatest majority of patients being classified as Keros type II.

Endoscopic anatomy of the anterior ethmoidal artery: Total asymmetry right xlassification left ethmoid roof low. Imaging of the paranasal sinuses and nasal cavity: Anatomy of the ethmoid: In most of cases, the classificxtion roof asymmetry was related to angulation of the lateral lamella of the cribriform plate.


About Blog Go ad-free. Computed tomographic imaging to determine the frequency of anatomical variations in pneumatization of the ethmoid bone.

Radiol Clin North Am. Cribriform plate lateral lamella depth values according to Keros classification. Asymmetrical ethmoid roof in a coronal paranasal sinus CT cross-section.

Therefore, extra care must be taken during surgeries on males. They reported a statistically significant height difference dlassification the right and left sides in women and men.

A long segment of the lateral lamella can be found in cases with a deep cribriform plate. As regards the olfactory fossae depth, the Keros’ type II was most frequently found.

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We performed a Keros classification of the ethmoid roof, determined the asymmetrical distribution ratios, and investigated the frequency of the anatomic variations of the para-nasal sinuses to further understand the anatomy of the skull base. Loading Stack – 0 images remaining. Schnipper D, Spiegel JH.

Besides the Keros classification, authors focused on the anatomic measurements as follows: In cases where asymmetry was observed, 5.

Luong A, Marple BF. This difference was statistically classifiication.

Coronal images can particularly be considered as maps in the evaluation of the anatomy that is highly variable even between the two sides of a same individual, demonstrating areas potentially at risk for complications in the planning of endoscopic nasal surgeries 12,14,17,19, Both in the present study and in the one developed by Lebowitz, there was a prevalence of lateral angulation to the left.


In type II, there is a serious hypoplasia and an abnormal uncinate process. Thin bone in the skull base, especially the cribriform plateis susceptible to erosion, encephalomeningocoele herniation and CSF leaks. The low skull base-is it important?

CT examinations should be used to explore the paranasal sinuses in the preoperative period because they provide a map for the surgical procedure and assist in complication avoidance. No study was found in the literature, correlating the presence of angulation of the lateral lamella of the cribriform plate with the Keros type of anatomical variation. In their study conducted on a Turkish population, Arikan et al.

Anterior clinoid process pneumatization: Keros classification of the olfactory fossa Keros classification. CT examination for endoscopic sinus surgery. Computed tomography CT has contributed not only to the evaluation of sinonasal diseases, but also to the characterization of the paranasal sinuses anatomy The differences between the results of this study and the other studies keos on Turkish populations may be due to the use of different measurement techniques.