الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
The UP is a thin shaped bony leaflet in the lateral wall of the nose that runs downwards and backwards and it is the most important structure of the osteomeatal complex.
The UP shows wide range of anatomical variations.
The knowledge of these variations of utmost importance in surgical management of sinusitis and especially in the prevention of complications.
The anatomical variations of UP in size, attachments, direction and pneumatization may affect the way of sinus drainage which may contribute to pathogenesis of sinusitis.
In the present study 10 cadaveric sagittally sectioned head regions, as well as 50 coronal CT scans were examined to detect different anatomical variations in UP.
A wide range of anatomical variations was detected, the most important ones are summarized as follows.
During cadaveric examination, UP showed wide range of variations in size and length. The average length of its vertical segment was between 7-18 mm and the average length of its horizontal segment was between 18-27 mm.
Regarding the site of anterior attachment, 50% of cases UP attached to lateral wall of the nasal cavity, 30 % of cases to the middle concha and in 20 % of cases to the cribriform plate. In CT examination UP attached in 38 % of cases to lateral wall of the nose, in 32 % of cases to middle concha, in 24 % of cases to cribriform plate, in 4 % of cases to the junction between middle concha and cribriform plate and in 2% of cases to the floor of the frontal sinus.
Pneumatization of UP was found in 10 % of cases in the cadaveric study but only in 4 % during CT examination.
Regarding the direction of UP, CT examination revealed that 54 % of cases were medially directed, 36 % of cases were vertically directed and 10 % of cases were laterally directed.
Rudimentary or very thin UP was found in 10 % of cadavers but only in 2 % of CT examination.