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.
Inverted papillomas are noncancerous tumors that form in the posterior aspect of the nasal cavities. As they grow, they can sometimes extend into the paranasal sinuses or orbits. Occasionally, inverted papillomas can undergo a malignant transformation into an aggressive form of cancer called squamous cell carcinoma.