Cystic fibrosis is a genetic respiratory condition that affects mucus in the lungs. It causes breathing problems, lung infections and other health problems.
Croup is usually cause by infection with viral laryngotracheobronchitis. It causes a hoarse voice, barking cough and a high-pitched wheeze on inhalation.
Pleural effusion is a lung disease in which fluid accumulates in the pleura, two ballon-like linings which surround and separate the lungs from the heart.