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Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

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Chapter Two The Thorax 103<br />

Fig. 2-76 An 11-year-old male<br />

German Shepherd dog had moderate<br />

dyspnea. An ultrasonographic<br />

examination of the cranial thorax<br />

revealed pleural effusion (PE), the<br />

heart (H), <strong>and</strong> a mass (M) in the<br />

cranial mediastinum. Diagnosis:<br />

Hydrothorax <strong>and</strong> thyroid carcinoma.<br />

Fig. 2-77 A 4-year-old female<br />

German Shorthaired Pointer with<br />

generalized peripheral lymphadenopathy.<br />

There is a soft-tissue<br />

density in the cranial ventral thorax,<br />

which represents sternal lymphadenopathy<br />

(closed arrows). There<br />

is an additional soft-tissue density<br />

that surrounds the tracheal bifurcation<br />

(open arrows). The caudal<br />

main stem bronchi are displaced<br />

ventrally. The radiographic findings<br />

are indicative of sternal <strong>and</strong> tracheobronchial<br />

lymphadenopathy.<br />

Diagnosis: Lymphoma.<br />

M E D I A S T I N A L A I R<br />

Air may accumulate within the mediastinum itself, known as pneumomediastinum, or<br />

within the esophagus. This may occur as a result of tracheal, bronchial, or esophageal<br />

perforation, perforating wounds at the thoracic inlet, or dissection of subcutaneous<br />

emphysema (Fig. 2-78). Pneumomediastinum with accompanying pulmonary intersti-

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