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Fig. 3. —Anomalous origin of right upper lobe segmental bronchi from right mainstem bronchus in 7-year-old girl with recurrent respiratory infections. Prior single-detector CT scan (not shown) was nondiagnostic because of respiratory motion. Multidetector CT scan was obtained in 4 sec and provided information that changed preoperative plan from lobectomy to segmentectomy. External three-dimensional volume-rendered image shows anomalous segmental bronchi (apical bronchus = 1, anterior bronchus = 2, posterior bronchus = 3) originate directly from right mainstem bronchus rather than from traditional right upper lobe bronchus. Severe bronchiectasis (arrows) in anterior segment can also be seen as well as mosaic pattern of lung attenuation. R = right, S = superior.