A 2-week-old pony foal was presented for recurrence of neurological dysfunction, obtunded-comatose mentation and collapse. Signalment, history, haematological and clinical chemical measurements and response to treatment prompted a presumptive diagnosis of hepatic encephalopathy secondary to a portosystemic shunt. This case differs from previous reported cases of congenital portosystemic shunts in horses due to the early onset of clinical signs, which usually occur at 2–6 months of age. In addition, in comparison with previously reported cases, this foal stabilised rapidly with minimal intervention. Contrast-enhanced computed tomography (CT) confirmed a left gastrocaval extrahepatic portosystemic shunt. Surgical intervention was not attempted due to financial constraints, so the foal was subjected to euthanasia, and on post-mortem examination, the anomalous vascular connection could clearly be identified.

中文翻译：

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小马驹左胃腔静脉门体分流术的表现、稳定性和对比增强计算机断层扫描 (CT) 诊断

一只 2 周大的小马驹因神经功能障碍复发、昏迷昏迷和虚脱而入院。信号、病史、血液学和临床化学测量以及对治疗的反应提示继发于门体分流的肝性脑病的推定诊断。该病例不同于之前报道的马先天性门体分流病例，因为临床症状出现较早，通常发生在 2-6 个月大时。此外，与之前报道的病例相比，这只小马驹在很少干预的情况下迅速稳定下来。对比增强计算机断层扫描 (CT) 证实左胃腔静脉肝外门体分流术。由于经济拮据，没有尝试手术干预，因此对小马驹进行了安乐死，并在尸检中，