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Provedor de dados:  OAK
País:  Japan
Título:  A case of intra-abdominal mass associated with the urachal remnant in a Holstein bullock
ホルスタイン去勢牛における尿膜管遺残の関与が疑われた腹腔内巨大腫瘤の1症例
Autores:  望月, 奈那子
滄木, 孝弘
伊藤, めぐみ
藤田, 理公
堀内, 雅之
古林, 与志安
猪熊, 壽
芝野, 健一
Data:  2016
Ano:  2016
Palavras-chave:  腹腔内腫瘤
尿膜管遺残
尿膜管憩室
限局性腹膜炎
尿石症
Intra-abdominal mass
Urachal remnant
Urachal diverticulum
Localized peritonitis
Urolithiasis
Resumo:  9カ月齢のホルスタイン去勢牛が食欲廃絶,乏尿および疝痛様症状を呈し,尿中からリン酸アンモニウムマグネシウムの結石が検出されたことから尿石症と診断された.対症療法を行ったところ,症状の増悪はないが食欲や全身状態の顕著な改善が得られないまま経過した.1カ月後,発熱,脱水症状,乏尿および腹囲膨満が認められ,尿路閉塞に伴う膀胱破裂が疑われたが,血清中クレアチニンおよび尿素窒素濃度の上昇など,膀胱破裂に特徴的な血液生化学的所見は認められなかった.確定診断に至らないまま予後不良と判断され,安楽殺された.病理解剖の結果,膀胱尖が小さく開口し,その先に腹腔の右側を占拠する巨大な腫瘤が認められた. 膀胱尖部の炎症性反応が乏しいことなどから,腫瘤のうち,膀胱と連絡する部分は遺残した尿膜管と診断された.また,腫瘤と周辺組織との癒着が広範囲にわたっていることから,尿膜管が何らかの原因により破綻し,尿が腹腔内に漏出したものの,大網に被覆された結果,腹膜炎が限局性にとどまり,巨大な嚢胞を形成するに至ったと推察された. 尿石症による尿路閉塞や膀胱破裂が疑われる症例において特徴的な血液生化学的所見が得られない場合は,月齢が進んだ個体であっても,尿膜管憩室やそれに起因する限局性の腹膜炎を類症鑑別に加える必要があると考えられた.

 A 9-month-old Holstein bullock that presented with anorexia, oliguria and colic symptoms was diagnosed to have urolithiasis based on numerous struvite calculi found in the urine. Symptomatic treatment did not improve the condition significantly. After 1 month, fever, dehydration, oliguria and abdominal distension were observed. Although bladder rupture associated with urinary tract obstruction was suspected, normal serum creatinine and urea nitrogen levels indicated otherwise. The bullock was euthanized for poor prognosis without a definitive diagnosis.  In the pathological examination, the apex of the bladder was connected to a large mass occupying the right side of the abdominal cavity. The mass likely originated from the urachus (urachal diverticulum) because there was no sign of inflammatory reaction in the bladder apex. Adhesion to the surrounding tissues indicated possible urine leakage through the broken urachus into the abdominal cavity. The greater omentum may have enclosed the leaked urine keeping peritonitis localized and forming a large mass. Thus, localized peritonitis caused by a ruptured urachal remnant should be included in the differential diagnosis when urinary tract obstruction and bladder rupture are suspected, even if the characteristic blood biochemical findings are not obtained.
Idioma:  Japonês
Identificador:  http://ir.obihiro.ac.jp/dspace/handle/10322/4522

info:doi/10.4190/jjlac.7.24
Editor:  日本家畜臨床学会・大動物臨床研究会
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