Radiological analysis of the ethmoid roof in the Malaysian population

Radiological Observation of Ethmoid Roof on Basis of Keros Classification and Its Application in Endonasal Surgery

“…Our findings were similar to Elwany et al who also reported that Keros type II was found more common in males and Kreos type I was found more common in females [11]. Literature review has shown asymmetry as the rule when comparing the height between right and left ethmoidal fovea [12][13][14][15]. Salroo et al in their study observed that there is a significant difference in the height of lateral lamella between the right and left side [16].…”

“…Out of 200 sides CT images studied, the most frequent Keros type was type II (59%) followed by type I (39%) and type III (2%). All studies, except Alazzawi et al have reported Keros II as the most common type followed by type I and III [7][8][9][10][11][12][13]. These studies are summarized in Table 3.…”

An Analysis of the Anatomic Variations of the Paranasal Sinuses and Ethmoid Roof Using Computed Tomography

“…With advances in endoscopie sinus surgery, CT examination has become a part of preoperative evaluation. Alazzawi et al [12] analyzed the ethmoid roof in 3 ethnic groups (150 cases from Malaysia, China, and India) and classified 80% ofthe cases as Keros Type I and 20% of the cases as Keros Type II. The lateral lamella, a thin bone component of the lamina cribrosa, forms the medial wall of the ethmoid roof.…”

“…Examinations were performed using tomography equipment (Philips Marconi MX8000, Royal Philips Electronics, Amsterdam, The Netherlands) with 4 detectors. The height ofthe lateral lamella was calculated by subtracting the cribriform height from the medial ethmoid roof height [12]. All shootings were performed on a coronal plane in a perpendicular projection from the hard palate with a 2.5 mm cross-section thickness and a 3 mm cross-section pitch.…”

“…They found an asymmetrical ethmoid roof height in 221 (31%) cases. In their study, Alazzawi et al [12] found asymmetry between the right and left LLCP heights in 139 (93%) cases. Reib et al [11] also reported a higher asymmetrical ethmoid roof height in men (38%) than in women (29%).…”