Summary Reasons for performing study: Thoracic trauma occurs in newborn foals and may cause associated clinical signs; this condition remains poorly documented. Objectives: The purpose of this study was to describe the pathological features of thoracic trauma in newborn foals presented for necropsy examination between 1990 and 2000. Methods: Necropsy reports of foals with thoracic trauma from 1990–2000 were reviewed. Subject details, clinical signs, thoracic and abdominal lesions were noted and analysed statistically. Results: Sixty‐seven (9%) of 760 necropsied foals had thoracic trauma. In 19 foals, fractured ribs were considered to be the cause of death (Group A). The remaining foals had fractured ribs (Group B, n = 20) or rib contusions (Group C, n = 28) that were incidental findings. Ribs 3 to 8 accounted for 86% of the traumatised bones. The most common site of injury was the costochondral junction and an area immediately above it (94%). In Group A, all but 2 foals died within the first 8 days post partum. Haemothorax and subsequent pulmonary collapse was cited most commonly as the cause of death (53%). Diaphragmatic rupture and hernia (n = 2) also occurred. Conclusions: The focal site, consistent location and presence of lesions during the first week post partum, all suggest that thoracic trauma in newborn foals probably occurs during parturition. Potential relevance: The description of lesions and site of occurrence of thoracic trauma in foals will increase awareness and improve the diagnosis and treatment of this life threatening condition.
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