Undiagnosed pulmonary sequestration results in an unexplained hemorrhagic shock in thoracoscopic pulmonary lobectomy.

We report the first case of pulmonary sequestration which was not detected in the preoperative evaluation, resulting in a life-threatening hemorrhagic shock rapidly during the procedure of thoracoscopic pulmonary lobectomy. The anesthesiologists could not figure out the reason for the hemorrhagic shock in the surgery until an emergent laparotomy was performed. The aim of presenting this clinical case is to highlight the vigilance for undiagnosed pulmonary sequestration which lacks any specific clinical feature but has the potential to become an anesthetic disaster.