Medical Definition of Sternum. Sternum: The long flat bone in the upper middle of the front of the chest. The sternum articulates (comes together) with the cartilages of the first seven ribs and with the clavicle (collarbone) on either side.
Bowen disease was first described in the medical literature by a physician named JT Bowen in 1912. Bowen disease is also known as squamous cell carcinoma in situ, and is generally considered an early, noninvasive form of intraepidermal squamous cell carcinoma.esions are usually not painful or may not be associated with any symptoms (asymptomatic). In most cases, treatment is highly successful. Bowen disease is considered a pre-cancerous condition, although the risk of developing skin cancer is less than 10 percent. The disorder usually affects older adults.
Most squamous cell cancers occur on skin that is regularly exposed to sunlight or other ultraviolet radiation. The earliest form of squamous cell cancer is called Bowen disease (or squamous cell carcinoma in situ). This type does not spread to nearby tissues because it is still in the outermost layer of the skin. Actinic keratosis is a precancerous skin lesion that may become a squamous cell cancer. (A lesion is a problem area of the skin.) Risks of squamous cell cancer include: Having light-colored skin, blue or green eyes, or blond or red hair.