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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Individual Taxpayer IRS Phone Numberâ 1-800-829-1040 â This number is for individual taxpayers to have their questions answered living in the US including the US Virgin Islands and Puerto Rico.perational Hours: This number is valid from 7am to 10pm within your local time zone. IRS Phone Number for Taxpayers Living Abroad (International) â If you are calling about an issue with filing electronically contact the Austin Office at 512-416-7550 (7am to 6pm CST)..