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a.1.(Anat.) Sphenethmoid.
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4%), sphenoethmoidal recess pattern in 3 (9%), and sporadic pattern was noted in 5 (15.
sup][3],[4] However, ESS requires strong familiarity with the anatomy of the sphenoethmoidal region and surrounding skull base structures because of the presence of critical structures such as the internal carotid artery (ICA), optic nerves, and ethmoidal artery.
During the second pass, superior turbinate, sphenoethmoidal recess and sphenoid sinus ostium were visualised.
During surgery, the patient was placed in the supine position, the nasal pack was removed under endoscopic guidance and the bleeding points, particularly those located in the olfactory fissure, sphenoethmoidal recess and middle nasal meatus, were clearly examined from a craniocaudal perspective after the application of topical anaesthesia using tetracaine and oxymetazoline hydrochloride spray (Fig.
2) These include: the infundibular pattern, with inflammation of the maxillary sinus and opacification of the ipsilateral ostium and infundibulum; the ostiomeatal unit pattern, with inflammation of the ipsilateral maxillary, frontal and ethmoid sinuses and occlusion of the middle meatus (Figure 1); the sphenoethmoidal recess pattern, with obstruction of the sphenoethmoidal recess and inflammation of the ipsilateral posterior ethmoid and sphenoid sinuses; the sinonasal polyposis pattern, which is characterized by the diffuse presence of polyps in the paranasal sinuses and nasal cavity; and the sporadic pattern, also termed unclassifiable, which is diagnosed when there is random sinus disease not related to ostial obstruction or polyposis.
Routinely, the turbinates, MM, sphenoethmoidal recess and nasopharynx were assessed for the presence of polyps, purulent secretion, and adenoid hypertrophy.
The third was the sphenoethmoidal recess, situated deep within the cavity near the roof of the nose and, like the middle meatus, warm, wet, and mucosal.
Posterior ethmoid drainage is into the sphenoethmoidal recess and superior meatus.
Basal meningoencephaloceles are further subclassified on the basis of the location of the bone defect as either transsphenoidal, transethmoidal, sphenoethmoidal, or sphenoorbital.
Since the advent of era of Endoscopic Sinus Surgery, the Onodi or Sphenoethmoidal cell has received renewed interest.
1,2) They usually originate from the bones of the skull base, at the sphenoethmoidal and spheno-occipital regions, but very rarely can also arise from other intracranial, extraosseous sites like the dura mater, the brain parenchyma or from within the ventricles.