Usually, this 5-inch body part is open to allow passage of air to & from the lungs
[DOC] [TLE] Lung Carcinoid Tumor - American Cancer Society [PAR] Feb 24, 2016 ... nearly any part of the body can become cancer, and can spread to .... Because 
carcinoid tumors usually grow and spread slowly, most are ... Large carcinoids 
can cause partial or complete blockage of an air passage, .... of the middle 
opening.