Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

Chapter Two The Thorax 143
Fig. 2-116 A and B, A 5-month-old
female West Highland White Terrier
was evaluated for a grade 5/6
holosystolic murmur. There were no
clinical signs associated with this
murmur. The cardiac silhouette
shows increased sternal contact and
rounding of the cranial border on
the lateral view. The ventrodorsal
view reveals an enlargement of the
main pulmonary artery segment.
The pulmonary vessels appear small.
Diagnosis: Pulmonic stenosis.
A
B
and 2-116). The degree of severity of the lesion may affect the degree of radiographic
change noted. Enlargement of the right ventricle and a poststenotic dilation of the main
pulmonary artery are present in most cases. 313-317 The size of the peripheral pulmonary
vessels is usually normal but they may be small.
Echocardiographic findings in pulmonic stenosis are consistent with the
radiographic changes. Aneurysmal dilation of the main pulmonary artery is usually