Pulmonary embolism is a condition that occurs when anartery in the lung becomes blocked. By far, the most commonform of pulomonary embolism is a thromboembolism, thatusually has migrated from a leg or pelvic vein. Once releasedinto the venous circulation, thromboemboli are distributed toboth lungs. Venous air embolism (VAE) is a potentially lethalcomplication that can occur during any surgical procedure inwhich the operative site is 5cm or higher above the right atriumor gas is forced under pressure into a body cavity. AlthoughVAE is typically described As a complication of neurosurgery, itcan occur during procedures involving the head and neck,laparoscopic procedures, vaginal delivery and caesarean section,and spinal instrumentation procedures. VAE has been reportedto occur during liver transplantation. Although manyoccurrences of AVE are asymptomatic, entrainment of largequantities of large quantities of air can lead to cardiovascularcollapse, severe neurological injuries, and death. Amniotic fluidembolus continues to be one of the most feared and devastatingcomplications of pregnancy. It can be neither predicted norprevented. Its presentation is variable and, similar to otherembolic phenomena, it is believed to encompass the spectrum ofdisease from a subclinical entry to one that is rapidly fatal.