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This 5 year old FS Australian Heeler has a history of regurgitation; heartworm positive. Rads show cranial thoracic mass, megaesophagus; gastrotomy tube placed. R/O thymoma with secondary myasthenia causing the megaesophagus.
This 5 year old FS Australian Heeler has a history of regurgitation; heartworm positive. Rads show cranial thoracic mass, megaesophagus; gastrotomy tube placed. R/O thymoma with secondary myasthenia causing the megaesophagus.
CT of the head/neck and thorax –
The left mandibular salivary gland is decreased in size and presents mildly irregular delineation as well as a non-uniform attenuation and enhancement pattern. The left medial retropharyngeal lymph node presents mild symmetric enlargement with maintained short-to-long axis of < 0.5 and maintained enhancement pattern.
The thoracic esophagus presents a large diverticulum containing gas, fluid and solid phases cranial to the heart. The aortic arch is to the right of the trachea and esophagus. Abrupt narrowing of the esophageal lumen is noted level with the aortic arch. There is no evidence of a cranioventral mediastinal mass lesion other than the esophageal diverticulum. The lung parenchyma presents two thin walled gas filled cavitary lesions.
A large amount of free peritoneal gas is noted.
Idiopathic pulmonary bullae within the right caudal lobe. There is a undetermined risk of spontaneous bulla rupture that cannot be quantified.
No evidence of thymoma;
Postsurgical leftsided mandibular salivary gland with suspected sialadenitis. The potential of a neoplasia is considered low based on the CT findings.
Reactive regional lymphadenitis;
Post surgical pneumoperitoneum.
There is no persistent leftsided cranial vena cava. No additional vascular malformation is identified other than the PRAA. The potential of residual perfusion of the ligamentum arteriosum needs to be considered even though there is no evidence of a hemodynamically relevant patent ductus arteriosus.
