A 4-month-old Thoroughbred filly presented with pyrexia, inappetence and diarrhoea. Abdominal ultrasonography revealed a multilobulated abdominal mass that was determined to be associated with the caecum using computed tomography. Computed tomography also identified mesenteric lymphadenopathy and a pulmonary mass in the left caudal lung lobe. Percutaneous aspiration of the abdominal mass yielded pure growth of Rhodococcus equi. The filly responded in a positive fashion to the administration of clarithromycin, rifampin and gallium maltolate. Follow-up computed tomography revealed complete resolution of the abdominal mass and lymphadenopathy. Extrapulmonary disorders associated with R. equi should be considered even when thoracic ultrasonography reveals no evidence of pulmonary pathology. Although intra-abdominal abscesses have a grave prognosis, successful treatment is possible. Gallium maltolate can be safely administered to foals and may improve patient outcomes.

中文翻译：

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马红球菌引起小马驹腹内大肿块的医疗处理

一头 4 个月大的纯种母马出现发热、食欲不振和腹泻。腹部超声检查显示腹部多叶肿块，使用计算机断层扫描确定与盲肠相关。计算机断层扫描还发现肠系膜淋巴结肿大和左肺尾肺叶肿块。腹部肿块的经皮抽吸产生了马红球菌的纯生长。小马对克拉霉素、利福平和麦芽酸镓的给药反应积极。后续计算机断层扫描显示腹部肿块和淋巴结肿大完全消退。与R. equi相关的肺外疾病即使胸部超声检查显示没有肺部病变的证据，也应考虑。虽然腹腔内脓肿预后很差，但成功治疗是可能的。麦芽糖镓可以安全地用于小马驹，并可能改善患者的预后。