Doctors in the Indian capital, Delhi, have performed a life-changing surgery on a 17-year-old boy to remove his "parasitic" twin that was attached to his abdomen. A parasitic twin is an underdeveloped ...

A pulmonary bleb is a small collection of air between the lung and the outer surface of the lung (visceral pleura) usually found in the upper lobe of the lung. When a bleb ruptures the air escapes ...