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1. Normal thymus

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Figure 7-1

Normal thymus.

A. An anteroposterior chest radiograph of a 6-month-old infant shows a prominent mediastinal silhouette caused by a normal thymus. Lordotic patient positioning accentuates superimposition of the thymus on the heart contour. B. The lateral view confirms normal heart size.

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2. Normal thymus

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Figure 7-2

Normal thymus.

A. An anteroposterior radiograph of a 2-month-old infant shows the "sail sign" (arrow) appearance of a normal thymus. B. The "thymic wave sign" (arrow) is visible on this radiograph of a 28-day-old infant.

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3. Ectopic thymus

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Figure 7-3

Ectopic thymus.

A. Sonography of a palpable mass adjacent to the right hemimandible shows an oval hypoechoic solid lesion (arrows). B, C. The lesion (arrows) also has a homogeneous appearance on T1-weighted (A) and fat-suppressed T2-weighted MR images. The orthotopic thymus is normal.

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4. Aberrant thymus

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Figure 7-4

Aberrant thymus.

This 9-year-old boy had a palpable mass adjacent to the left lobe of the thyroid. A. An axial fat-suppressed T2-weighted image shows a small homogeneous soft-tissue mass (arrow) at the base of the neck anterior to the trachea. B. A sagittal short tau inversion recovery (STIR) image shows connection to the orthotopic thymus via a thin stalk (arrow).

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5. Bronchogenic cyst

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Figure 7-5

Bronchogenic cyst.

A. An oval soft-tissue density mass (arrow) causes extrinsic impression on the posterior-right lateral aspect of the esophagus. B, C. The cystic paraspinal mass is homogeneously hyperintense on T2-weighted MR images. A thin capsule (arrow) is visible on the axial image.

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6. Bronchogenic cyst

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Figure 7-6

Bronchogenic cyst.

A. There is a large middle mediastinal cyst on this contrast-enhanced CT image of a teenage girl with recurrent pneumonias. B. A reformatted coronal image demonstrates the proximity to the carina and main bronchi.

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7. Enteric duplication cyst

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Figure 7-7

Enteric duplication cyst.

A, B. Axial and coronal contrast-enhanced CT images of a 5-month-old child show a cystic mass (arrows) adjacent to the left side of the air-filled esophagus.

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