Incomplete expansion or collapse of part or all of a lung due to mucus, tumor, or a foreign body that blocks the bronchus is called:.

Atelectasis

Explanation:

Atelectasis is a medical ailment which affects the respiratory system. It is formed as a result of incomplete expansion or collapse of part or all of a lung due to mucus, tumor, or a foreign body that blocks the bronchus.

It is however common with people who are asthmatic other have lung diseases and it is characterized by low fever, breathing difficulty .