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1. A considerable amount of variation exists in the development of the sphenoid sinus. Classification of these variations for convenience in roentgenographic analysis is given.
2. For a complete evaluation of the sphenoid sinus, the routine sinus roentgenographic series is not sufficient. If a lesion in the sphenoid sinus is suspected, unless the lesion is quite obvious on routine roentgenograms, thin-section tomography should always be obtained.
3. Some abnormal and normal developmental variations of the sphenoid sinus are presented to emphasize the importance of recognition of normal variations which mimic disease.
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