If a large volume of nitrogen in the lungs is replaced with oxygen, the oxygen may subsequently be absorbed into the blood, reducing the volume of the alveoli, resulting in a form of alveolar collapse known as absorption atelectasis. Compression (relaxation) atelectasis
It is usually associated with accumulation of blood, fluid, or air within the pleural cavity, which mechanically collapses the lung. This is a frequent occurrence with pleural effusion, caused by congestive heart failure (CHF). Leakage of air into the pleural cavity (pneumothorax) also leads to compression atelectasis. Cicatrization (contraction) atelectasis
It occurs when either local or generalized fibrotic changes in the lung or pleura hamper expansion and increase elastic recoil during expiration. Causes include granulomatous disease, necrotising pneumonia and radiation fibrosis. Chronic atelectasis
Chronic atelectasis may take one of two forms—middle lobe syndrome or rounded atelectasis. Right middle lobe syndrome
In right middle lobe syndrome, the middle lobe of the right lung contracts, usually because of pressure on the bronchus from enlarged lymph glands and occasionally a tumor. The blocked, contracted lung may develop pneumonia that fails to resolve completely and leads to chronic inflammation, scarring, and bronchiectasis. Patchy atelectasis
Is due to lack of surfactant, as occurs in hyaline membrane disease of newborn or acute (adult) respiratory distress syndrome (ARDS). Rounded atelectasis
In rounded atelectasis (folded lung or Blesovsky syndrome), an outer portion of the lung slowly collapses as a result of scarring and shrinkage of the membrane layers covering the lungs (pleura), which would show as visceral pleural thickening and entrapment of lung tissue.
Peter and Andrew, apostles
Sts. James and John, apostles
My Brother, My Brother, and Me, podcast
Saving Private Ryan (1998), film
Simon & Simon, television series
Supernatural, American television series
The Brothers Karamazov, novel
The Wayans Bros., television series
Bonanza (1959–1973), television series
In the Ramayana:
Rama, Lakshmana, Bharata, and Shatrughna
In the Mahabharata:
The Pandavas – Yudhishthira, Arjuna, Bhima, Sahadeva and Nakula
The Kauravas – One hundred brothers including Duryodhana, Dushasana and Vikarna, among others

See also
Sister
Brotherhood (disambiguation)
Stepsibling

References
External links
 The dictionary definition of brother at Wiktionary