Changes

[[Image:Gross Heart.jpg|thumb|200px|Gross heart with pericardium removed]][[Image:Liver pathology.jpg|thumb|200px|Masses in liver]][[Image:Low power.jpg|thumb|200px|Low power micrograph of mass]]

[[Image:Gross Heart.jpg|thumb|200px|Gross heart with pericardium removed]][[Image:Liver pathology.jpg|thumb|200px|Masses in liver]][[Image:Low power.jpg|thumb|200px|Low power micrograph of mass]]

You are presented with a case of a 9 year old, male neutered golden retriever.  The dog had a history of sudden death. On gross examination the pericardial sac was full of blood.  

You are presented with a case of a 9 year old, male neutered golden retriever.  The dog had a history of sudden death. On gross examination the pericardial sac was full of blood, a 4cm mass is present on the right atrium.  

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Multifocal to coalescing, dark red, pinpoint to 5cm masses were also present throughout the liver.

Multifocal to coalescing, dark red, pinpoint to 5cm masses were also present throughout the liver.

question="

question="

Which of the following is the most likely diagnosis?

Which of the following is the most likely diagnosis for this right atrial mass?

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choice5="Haemangiosarcoma"

choice5="Haemangiosarcoma"

feedback3="'''Incorrect.''' Cellular pleomorphism, anisocytosis, anisokaryosis, high mitotic index and lack of tissue organisation are all histological features of malignancy. The spindle shape of the neoplastic cell population is indicative of a malignant mesenchymal tumour i.e. a sarcoma. The formation of blood-filled channels and spaces is typical of a tumour of endothelial cells, which under normal circumstances are responsible for lining the internal surface of blood vessels. The diagnosis in this case is therefore haemangiosarcoma.[[Haemangiosarcoma|WikiVet Article: Haemangiosarcoma]]  

feedback3="'''Incorrect.''' Cellular pleomorphism, anisocytosis, anisokaryosis, high mitotic index and lack of tissue organisation are all histological features of malignancy. The spindle shape of the neoplastic cell population is indicative of a malignant mesenchymal tumour i.e. a sarcoma. The formation of blood-filled channels and spaces is typical of a tumour of endothelial cells, which under normal circumstances are responsible for lining the internal surface of blood vessels. The diagnosis in this case is therefore haemangiosarcoma.[[Haemangiosarcoma|WikiVet Article: Haemangiosarcoma]]  

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image= "">

image= "File:Right atrium cropped.jpg">

</WikiQuiz>

</WikiQuiz>