Vaginitis emphysematosa occurs primarily in pregnant women, but there are some cases of non-pregnant women too.[4] It is a rare, benign vaginal cyst identified in 173 cases.[5][6][7][8] Women that have been affected were 42 to 65 years old.[6] The cysts appear grouped but defined from one another, smooth, and can be as large as 2 cm.[5] Symptoms included: vaginal discharge, itching, sensation of pressure, appearance of nodules, and sometimes a "popping sound".[5][9]