"A haemopneumothorax (plural: haemopneumothoraces) (or, less commonly, haematopneumothorax or pneumohaemothorax) is a term given when there is concurrent presence of a haemothorax and pneumothorax. It is a variant of a hydropneumothorax."
Line 1:81·Use the Oxford comma in 'commonly, haematopneumothorax or pneumohaemothorax'.