Primary cardiac hemangiosarcoma in a horse: echocardiographic and necropsy findings.

The research deals with a rare case of primary cardiac hemangiosarcoma, a heart tumor, in a horse. Detected with the use of echocardiography, the study provides detailed diagnostic findings from an initial presentation of tongue swelling and dehydration to postmortem confirmation of the tumor with no further spread.

Introduction and Presentation

• The research discusses a very rare occurrence of primary cardiac hemangiosarcoma, which is a type of heart tumor, in a 17-year old American Quarter Horse.
• The case was initially presented as tongue swelling in the horse, followed by secondary aspiration pneumonia, a condition where foreign bodies are inhaled into the branches of the lungs.
• The horse was also found to be severely dehydrated at the time of initial assessment.

Diagnostic Process

• During the diagnostic process, thoracic ultrasound was initially used, which revealed an abnormal structure within the horse’s heart muscle which was suspected to be associated with aspiration pneumonia.
• To gain further clarity on the condition, a complete echocardiogram was performed. This detailed heart imaging technique suggested presence of a large, heterogeneous, ill-defined mass invading and replacing the normal heart muscle of the right ventricular free wall.

Outcome and Postmortem Findings

• Despite the detailed diagnosis, the condition of the horse did not show any improvement leading to the hard decision of euthanizing the animal to relieve it of the fetching pain.
• After euthanization, a postmortem examination was conducted which confirmed that the abnormal mass was indeed a primary cardiac hemangiosarcoma.
• Interestingly, no other masses were found in other organs, therefore classifying it as ‘primary’ that is originating from heart and not metastatic.

Significance of the Case

• This case was particularly remarkable as it was identified as an unusual presentation of primary cardiac hemangiosarcoma in horses, a condition not commonly reported.
• The role of echocardiography was found to be highly significant in identifying and confirming the heart tumor. This underscores the importance of such diagnostic tools in veterinary medicine.