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1. Left pulmonary agenesis

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Figure 1-1

Left pulmonary agenesis.

A, B. Anteroposterior and lateral radiographs show a small left hemithorax and leftward shift of the mediastinal structures. The left lung is absent. There is marked leftward displacement of hyperexpanded right lung.

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2. Pulmonary agenesis

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Figure 1-2

Pulmonary agenesis.

There is no aerated right lung on this anteroposterior chest radiograph of a newborn infant. The hyperinflated left lung herniates across the midline (arrows). There is rightward shift of the trachea. The outlines of the heart are not visible; the soft-tissue density of the cardiac structures in the right hemithorax is contiguous with that of the liver. There are right-sided rib deformities and spinal segmentation anomalies.

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3. Pulmonary hypoplasia

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Figure 1-3

Pulmonary hypoplasia.

A. An anteroposterior chest radiograph of a newborn with respiratory distress and abdominal distention shows small-volume lungs, elevation of the diaphragm, and mild cardiomegaly.

B. An abdominal radiograph shows large flank masses caused by polycystic kidney disease, resulting in abdominal distention, displacement of bowel, and elevation of the diaphragm.

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4. Pulmonary hypoplasia

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Figure 1-4

Pulmonary hypoplasia.

Anteroposterior and lateral chest radiographs of an asymptomatic 4-year-old child show diminished size of the right lung, with obscuration of the right cardiomediastinal border, rightward shift of the mediastinal structures, and lack of appropriate anterior extension of the right lung (arrows) on the lateral view.

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5. Bronchial atresia

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Figure 1-5

Bronchial atresia.

The left lung is hyperinflated and oligemic. A bronchocele appears as a small ovoid parahilar mass (arrow).

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6. Intralobar sequestration

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Figure 1-6

Intralobar sequestration.

A, B. Posteroanterior and lateral chest radiographs show a homogeneous soft tissue-density mass in the posterior basal portion of the left lung. Air bronchograms are lacking. The patient had no symptoms of pneumonia, and follow-up radiographs (not shown) demonstrated persistence of the opacity.

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7. Intralobar sequestration

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Figure 1-7

Intralobar sequestration.

A. There is a somewhat heterogeneous left lower-lobe mass ...

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