If air enters the pleural space either by a hole in the lung or the chest wall, the pressure in the pleural space equals the pressure outside the body. Thus, the vacuum is lost and the lung collapses. Spontaneous pneumothorax is caused by a rupture of a cyst or a small sac (bleb) on the surface of the lung.
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Call the toll-free IRS telephone number for individuals if you are calling about a personal tax matter. This number is 1-800-829-1040. The business hours are between 7:00 a.m. and 7:00 p.m. in your local time zone. 2. Use the 1-800-829-3676 number for assistance completing your tax forms. This number is the quickest way to get in touch with a specialist trained to assist you in filling out your return forms. Business hours are 7:00 a.m to 7:00 p.m. local time, Monday through Friday.