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==Diagnosis==
==Diagnosis==
===Clinical Signs===
===Clinical Signs===
*Congenital fistulae develop signs post weaning
*Acquired fistulae develop in later life
*Coughing
*Dyspnoea
*Regurgitation
*Lethargy
*Anorexia
*Fever
*Weight loss
===Diagnostic Imaging===
'''Survey radiography''': localized lung patterns (alveolar, bronchial and/or interstitial) mainly in right caudal, right intermediate and left caudal lung lobes. The oesophagus appears normal unless a foreign body can be observed.
'''Contrast radiography''': can provide definitive diagnosis using a barium sulphate oesophogram. '''Avoid iodinated contrast agenst as they are irritants to the lungs.'''
'''Endoscopy''': also allows definitive diagnosis if the fistula is large enough to be visualised.
==Treatment==
==Treatment==