A fallopian tube cyst (paratubal) is a fluid-filled mass that forms on or near the fallopian tube.
While commonly occurring in older women, young girls and teenagers can also develop fallopian tube cysts. The two fallopian tubes are part of the reproductive system that transports the ova (egg) from the ovary (where eggs are produced) to the uterus (the womb) every month.
Fallopian tube cysts are fluid-filled sacs that often go undiagnosed and remain very small. The cysts are typically small (approximately 2 to 20 mm), but they can grow larger, can become >15 cm. Most paratubal cysts are benign (not malignant) and simple (one compartment).
Symptoms for large (over 4 cm) cysts include pain due to torsion. Small fallopian cysts typically don’t have symptoms.
Complications may occur in some cases and can include the following:
During development in the womb, all children have a Wolffian duct (the area where male sex organs are formed). The duct will shrink away as girls develop their female sex organs. If some remnants of the duct remain, the paratubal cysts will grow out from these areas. The cysts may also form out of the remnants of the paramesonephric or Müllerian duct (the area where the female sex organs are formed).