acute bilateral airspace opacification (differential).acute unilateral airspace opacification (differential).differential diagnoses of airspace opacification.differential of left paramediastinal catheter positions.peripherally inserted central catheters.evaluation of endotracheal tube position.evaluation of nasogastric tube position.A less common normal variant of the left upper lobe is a left horizontal fissure. The horizontal fissure is complete in only one-third of people and is absent in 10% of people 2. It runs horizontally at the level of the right 4 th costal cartilage from the hilum to the anterior and lateral surfaces of the right lung. The horizontal fissure (also known as the minor fissure or transverse fissure) is found in the right lung where it separates the upper and middle lobes. The left oblique fissure has a more vertical course compared to the right oblique fissure 2. It extends from the level of the T4/T5 vertebrae posterosuperiorly to the hemidiaphragms anteroinferiorly and is gently undulating in nature. The oblique fissure (also known as the major fissure) is similar for both lungs. There are numerous accessory fissures that are common anatomical variants. Lung fissures are double-folds of visceral pleura that either completely or incompletely invaginate lung parenchyma to form the lung lobes.Įach lung has an oblique fissure separating the upper lobes from the lower lobes and the right lung has a horizontal fissure that separates the right upper lobe from the middle lobe.
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