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Fig. 4B. —3-year-old girl with recurrent upper airway infections and
nocturnal cough (6-MDCT, phase 2; effective dose, 0.065 mSv). Sphenoid sinuses
may be absent or very small in young children and mistaken for posterior
ethmoid cells in axial or coronal images. Sagittal images can help identify
them; normal right sphenoid sinus (asterisk) and opacification of
posterior ethmoid cells (arrowhead) are indicated.
