CXR may show visceral herniation
Poorly sensitive
CT chest/abdomen/pelvis with contrast may better detect smaller herniations (roughly 82% sensitive and 88% specific) 
"Collar sign"
waist-like constriction of abdominal viscera
MRI better evaluates the diaphragm itself in stable patients in whom the diagnosis is unclear
Surgical exploration is ultimately the best diagnostic modality (thoracoscopy vs laparoscopy vs ex-lap depending on concurrent injuries)
Thoracoscopy
Laparoscopy
Poorly sensitive
"Collar sign"
waist-like constriction of abdominal viscera
waist-like constriction of abdominal viscera
Diaphragmatic trauma
Airway/Pulmonary
Chylous leak
Bronchial injury
Tracheostomy complications
Tracheostomy dislodgement
Hemothorax
Tracheal injury