A collapsed lung, also known as a pneumothorax, occurs when air escapes out of a lung and becomes trapped inside the space between the chest and lung cavities. This can be caused by air blisters in the lungs that break open, sudden air pressure changes, or trauma to the chest or ribcage.
The IRS interpreted this provision as applying only to full-time students. In a 1993 technical advice memorandum, the IRS provided a safe-harbor definition of a full-time undergraduate student as one who is taking 12 credit hours and working no more than 20 hours per week.
Definition of full-time studies. A student's full-time-status â as defined by Quebec's Aide financiÃ¨re aux Ã©tudes to assess a student loan or bursary â is determined by the number of credits for which she or he is registered at the close of the tuition refund period, in the following way: Registration for the Summer session: 12 credits.