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The mastoid cells (also called air cells of Lenoir or mastoid cells of Lenoir) are air-filled cavities within the mastoid process of the temporal bone of the cranium. The mastoid cells are a form of skeletal pneumaticity. Infection in these cells is called mastoiditis. The term cells here refers to enclosed spaces, not cells as living ...
Cholesteatoma is a destructive and expanding growth consisting of keratinizing squamous epithelium in the middle ear and/or mastoid process. [1] [2] Cholesteatomas are not cancerous as the name may suggest, but can cause significant problems because of their erosive and expansile properties.
The mastoid process is located posterior and inferior to the ear canal, lateral to the styloid process, and appears as a conical or pyramidal projection. It forms a bony prominence behind and below the ear. [1] It has variable size and form (e.g. it is larger in the male than in the female). It is also filled with sinuses, or mastoid cells.
About 20% of breast cancers diagnosed in the U.S. each year are DCIS. Many of them do not go on to become cancers—but a small percentage of so-called high grade DCIS do, and doctors only have ...
There is some controversy as to whether these cancer cells travel through the ductal system of the breast to the nipple, [9] or whether these cells result from in situ malignant transformation. [ 2 ] The most widely accepted theory of how Paget's disease of the breast arises is the migratory theory: ductal carcinoma in situ cancerous cells ...
Causes of pain under your left breast There can be a bunch of different potential reasons why you’re having pain in this area, but doctors say these are the biggest ones to keep in mind. Heart ...
Inflammatory breast cancer [1] (IBC) is one of the most aggressive types of breast cancer. It can occur in women of any age (and, extremely rarely, in men, see male breast cancer [ 2 ] ). It is referred to as "inflammatory" due to its frequent presentation with symptoms resembling a skin inflammation, such as erysipelas .
Triple-negative breast cancer. Triple-negative breast cancer acts aggressively, grows quickly, spreads further and is more likely to return, the American Cancer Society says. It often occurs in ...