1. A teratoma, a type of (usually noncancerous) tumor made out of all kinds of nasty stuff (including hair, teeth, and/or EYES) that start to grow in parts of the body where they don't belong.
2. Remember the girl in "Skin Deep" who was suffering from a rare form of hermaphroditism? It can happen to people who have been living as men their whole lives too. Turns out there have been several cases of older men going to the hospital for what they think are kidney stones, but they learn they actually have ovary cysts, or tumors or other issues with parts they never knew they had.