CTA of chest revealing large residual clot in the right hemi-thorax. This study was performed in an attempt to localize the bleeding source in our patient. The study was negative in terms of identifying an anatomic source of bleeding (most relevant with respect to examination of the great vessels in the thoracic outlet, albeit falsely negative). However, this study served as a proxy for the post-thoracostomy chest x-ray and identified the insufficient drainage of the right chest with the thorocostomy tube in place.