Bicycle Valve Stem Types. There are three types of bicycle valve stems in use: Schrader, Presta and Woods/Dunlop. The Woods or Dunlop valve stem style is much more rare than the other two. Any wheel rim that fits a Schrader valve can also fit a Woods or Presta valve.
Papilloma and Papillomatosis. A papilloma is a benign growth found in breast ducts, which has âfinger-likeâ fronds, and often completely blocks the duct. Papillomas are composed of âmammary epitheliumâ which are the cells that comprise the duct-wall linings of the breast.
For some papillomas though, HPV is not the main cause. One example is inverted papilloma of the urinary tract, which has been linked to smoking and other potential causes. For papillomas in the skin where HPV is known to be the cause, damage to the skin can help the virus to cause a wart.