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.
Papillary breast cancer is a very rare type of invasive ductal breast cancer that accounts for fewer than 1% of all breast cancers. The name comes from finger-like projections, or papules, which are seen when the cells are looked at under the microscope. Many papillary tumors are benign. These are called papillomas. Even when a biopsy is negative for cancer, the pathologist often needs to look at the whole tumor under the microscope to be sure about the diagnosis. This is why surgery to remove a papilloma is usually recommended, even if it is thought to be benign.