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A pluriparous buffalo in 7th month of gestation was presented with history of anorexia since last 15 days and abdominal distention past one month. Per vaginum examination revealed the presence of fluid thrills with no palpation of fetus, fetal parts and cotyledons. Ultrasonography of the abdomen shows mild to moderate pleural effusions in thoracic cavity, reticulum being pushed to 6th inter-coastal space, intestinal loops pushed cranially in the abdomen and anoechoic fluid seen in abdomen suggesting of hydroallantois. Our treatment regimen followed by regular per vaginum examination generated positive outcome with dam recovered uneventfully. Histopathological examination suggested uterine epithelium hyperplasia and arterial thrombosis causing obstruction in the normal blood supply. Fibrinoid necrosis was also observed in few smaller blood vessels which are mostly encountered in antigen-antibody complex reaction. Apart from successful management following treatment regimen and frequent examination, we also hypothesize a new etiology behind hydroallantois in this case.
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