KEY: Anterior (A); Posterior (P); Medial (M); Lateral (L); Optic Nerve (ON); Optic Chiasma (Ch); Internai Carotid Artery (ICA); Intersinus Septum (IS); Crista Galli (CG); Left Sphenoidal Sinus (LSS); Right Sphenoidal Sinus (RSS); Posterior
Ethmoidal Cell (PEC);
Ethmoidal Cells (ECs)
In this study, the AN cells were defined as the anterior
ethmoidal cell pneumatized from the frontal recess, as previously defined by Messerklinger (4).
Frontal sinuses formation starts at two years old, but its pneumatization occurs only around 6-7 years old, because of the migration of the
ethmoidal cell to the frontalis bone (PIGNATARY et al., 2004).
Pyocele of the posterior
ethmoidal cell as the cause of visual loss.
This is a posterolateral pneumatization of posterior
ethmoidal cell coming into intimate relationship with optic nerve.
[12] The bulla was found to be the most constant
ethmoidal cell and the key area for approaching either the anterior or the posterior group of air cells.
Onodi Cell: This is a posterolateral pneumatization of posterior
ethmoidal cell coming into intimate relationship with optic nerve.
[11] Its size is an important factor when associated with opacification of anterior
ethmoidal cells at CT in patients diagnosed with sinusopathy.
An intraorbital foreign body with triangular shape of 4.6 cm x 2 cm was seen in the left orbit, passing through the orbit and the ocular globe, fracturing the superomedial wall of the orbit, with a probable associated fracture of the
ethmoidal cells, and reaching the anterior cranial fossa, causing pneumocephalus (Figures 1 and 2).
Paranasal sinus computerized tomography (CT) revealed a hypodense mass lesion that filled both frontal sinuses and right
ethmoidal cells, caused erosion in the bone structures, and drooped into the right orbital extraconal area eroding the right lamina papricea (Figure 1).
Computed tomography (CT) of the facial sinuses revealed a large, solid, voluminous mass in the right nasal cavity, measuring 3.8 x 3.1 x 5.1 cm along its largest axes and extending into the left nasal cavity,
ethmoidal cells, and cribriform plate, causing erosion of the plate.