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History: 10 year old female intact Yorkshire Terrier. 1 month history of distended abdomen, 23 week history of lethargy.
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Overall this case was well done. The candidates that failed this question did so because they either failed to identify the mass and tubular structure as ovary and uterus or the primary differential diagnosis was a ruptured pyometra with septic peritonitis. The tubular structure filled with anechoic fluid has a thick irregular wall with numerous cysts and no distinct layering and was therefore not small intestine. A diagnosis of septic peritonitis secondary to rupture of a pyometra was also presented but there was no explanation of why the echogenicity of the fluid was so different between the abdominal fluid and the fluid in the uterine horns or why the uterine horns remained so distended.
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