الفهرس 
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Abstract
Sinusitis is an inflammation or swelling of the tissue lining the sinuses. Normally sinuses are filled with air but when sinuses become blocked and filled with fluid and germs (bacteria, viruses, and fungi) can grow and cause an infection, a dental infection is a predisposing factor as Sinusitis with an odontogenic source accounts for 20% of all cases of maxillary sinusitis.
There are different types of sinusitis including: Acute sinusitis which is a sudden onset of cold-like symptoms such as runny, stuffy nose and facial pain that does not go away after 10 to 14 days, Sub acute sinusitis which is an inflammation lasting 4 to 8 weeks, chronic sinusitis which is a condition characterized by sinus inflammation symptoms lasting 8 weeks or longer.
Symptoms of chronic sinusitis are the same as those of acute sinusitis, but tend to be milder and last longer than 12 weeks, for diagnose sinusitis, a physical examination by pressing over the sinuses for tenderness, also tap over teeth to see if inflamed paranasal sinus due to dental infection, other diagnostic tests to assess the potential causes for sinusitis may include conventional radiographic image and Computerized Tomography(CT) scan of the sinuses, CT scan is recommended for sinusitis lasting more than 12 weeks.
Plain radiographs may useful in the diagnosis of chronic maxillary rhinosinusitis in which they show features of fluid level while findings of haziness and opacity are of less diagnostic value. However, CT scan was considered as a gold standard for the diagnosis of maxillary sinus infection.
This study was aiming to evaluate maxillary sinus infection by multislice computerized tomography.
Twenty patients with chronic sinusitis were included in this study, all patients were selected from the Out Patient Clinic of Minia University Hospital. The patients were of both sexes and varying ages from 18 to 60 years old, with mean age of 35 years old ,all cases were subjected to history taking, thorough clinical examination following a standardized protocol and a radiographic imaging using a conventional cross section radiography and MDCT.
All images were statistically analyzed to reveal the efficiency of MDCT in evaluation of maxillary sinus infection and relation between related infected tooth and the MDCT finding. The results of the current work confirmed the higher sensitivity of the MDCT in the evaluation maxillary sinus infection by Lund-Mackay CT scoring system through the severity of the mucosal thickening or fluid accumulation in addition to ostiomeatal complex (OMC) and thus the severity of sinusitis.