Some sources claim this entity represents 3 to 6% of pneumothorax in women. In regard of the low incidence of primary spontaneous pneumothorax (i.e. not due to surgical trauma etc.) in women (about 1/100'000/year), this is a very rare condition. Hence, many basic textbooks do not mention it, and many doctors have never heard of it. Therefore,<unk>  is probably under-recognized.
Catamenial pneumothorax
Pneumothorax ex vacuo
Tracheoinnominate fistula
Pulmonary hematoma
Tonic tensor tympani syndrome
Tracheal deviation
Hemothorax
Chylothorax