A thoracic ultrasound will briefly examine the heart for more obvious changes, but will also look closely at lungs, cranial mediastinum, pleura, etc.
It is quite common to do it as part of an abdominal ultrasound protocol, as well as an echocardiography.
As with abdominal ultrasound, FNAs can be performed of any abnormal structures or masses.
The Ultrasound Vet 