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==Signalment==
 
==Signalment==
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Newborn foals.  More common in colts than fillies, particularly if they are overdue.  This may be related to a narrower pelvic inlet.
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Newborn foals.  More common in colts than fillies, particularly if they are overdue.  This may be related to a narrower pelvic inlet in colts.<ref>Martens, R.J (1982) Pediatrics. In: Equine Medicine and Surgery, 3rd edn., Eds: R.L. Mannsman and E.S. McAllister, American Veterinary Publications, Santa Barbara. pp 333-334. In: </ref>
Male foals appear to be
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more commonly affected than fillies due to the smaller pelvic
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inlet in the colt (Martens 1982).(Pusterla)
      
==Aetiology==
 
==Aetiology==
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