A<unk>  is a medical condition wherein a piece of tissue that ultimately develops into lung tissue is not attached to the<unk>  arterial blood supply, as is the case in normally developing lung. This sequestered tissue is therefore not connected to the normal bronchial airway architecture, and fails to function in, and contribute to, respiration of the organism. This condition is usually diagnosed in children and is generally thought to be congenital in nature. More and more, these lesions are diagnosed in utero by prenatal ultrasound.
Pulmonary sequestration
Cryptogenic organizing pneumonia
Lung abscess
Rheumatoid pleuritis
Atypical pneumonia
Lobar pneumonia
Malignant pleural effusion
Pulmonary alveolar proteinosis