title: Pathology of lethal peripartum broad ligament haematoma in 31 Thoroughbred mares.
abstract: BACKGROUND
  Broad ligament haemorrhage in peripartum mares is a life-threatening disease and there are few reports on the aetiology and pathogenesis of broad ligament haematoma.
  
  
  OBJECTIVE
  To obtain information regarding the sites for the early diagnosis and pathogenesis of broad ligament haematoma of mares.
  
  
  METHODS
  Thirty-one mares that died of broad ligament haematoma peripartum were examined pathologically for bleeding sites. The arterial distribution of 5 young mares with several parities served as negative controls.
  
  
  RESULTS
  Age and/or multiparity were the predisposing factors for the disease. Arterial injuries were most commonly observed in the uterine artery (24 of 31 mares). Among these, the proximal uterine artery that lies within 15 cm of the bifurcation of the iliac artery was the most frequent site for rupture (18 mares). The lesions occurred preferentially at the bifurcations, lateral part of curvatures and abrupt flexures of the artery. The morphology of the injuries was classified into 3 types: ruptures with and without longitudinal fissures, and transections. Histologically, the arterial wall adjacent to the rupture showed atrophy of smooth muscle cells with fibrosis of the tunica media and disruption and/or calcification of the internal elastic lamina.
  
  
  CONCLUSIONS
  Arterial injuries that led to broad ligament haematoma in peripartum mares occurred most frequently in the proximal uterine artery, and atrophy of smooth muscle cells with fibrosis of the arterial wall was as one of the predisposing factors in aged and multiparous mares.
  
  
  CONCLUSIONS
  Monitoring small aneurysms, mural tearing, medial fibrosis at the proximal uterine artery by transrectal echography could provide useful information for the early diagnosis and possible prevention of broad ligament haematoma of peripartum mares.
authors: Clinical Science and Pathobiology Division, Equine Research Institute, Japan Racing Association, Utsunomiya, Japan. ueno@center.equinst.go.jp
authors: T
authors: T
authors: Ueno
authors: Y
authors: Y
authors: Nambo
authors: Y
authors: Y
authors: Tajima
authors: T
authors: T
authors: Umemura
mesh_terms: D000818:Animals; D001956:Broad Ligament / Q000293:injuries*; D005260:Female; D006406:Hematoma / Q000473:pathology / Q000662:veterinary*; D006734:Horse Diseases / Q000473:pathology*; D006736:Horses; D007744:Obstetric Labor Complications / Q000473:pathology / Q000662:veterinary*; D011247:Pregnancy; D055988:Uterine Artery / Q000293:injuries / Q000473:pathology; D014599:Uterus / Q000098:blood supply