What is a hyperplastic polyp in the stomach? A hyperplastic polyp is a non-cancerous growth that develops from the tissue that lines the inside of the stomach. Another name for this growth is an inflammatory polyp. What causes a hyperplastic polyp in the stomach? Most hyperplastic polyps in the stomach are associated with a condition …
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What is autoimmune hepatitis? Autoimmune hepatitis is a type of autoimmune liver disease. It is caused by immune cells attacking and damaging the specialized hepatocytes in the liver. It occurs in all ages and is seen in women three to four times more often than in men. What are the symptoms of autoimmune hepatitis? The …
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Atrophic endometrium is a term used to describe endometrial tissue (the lining of the uterus) that is smaller, thinner, and less active than normal. This is a benign change, meaning it is not cancer. Atrophy is a natural process that occurs when the endometrium is no longer stimulated by estrogen and progesterone, the hormones that …
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Acute appendicitis means sudden inflammation of the appendix, a small, finger-shaped pouch attached to the first part of the large intestine (colon). In most people, the appendix is located in the lower right side of the abdomen, just above the hip bone. Acute appendicitis is a common condition and can affect people of all ages, …
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Actinic keratosis (AK) is a pre-cancerous skin condition caused by long-term damage from ultraviolet (UV) radiation, most often from the sun. It is made up of abnormal skin cells called keratinocytes, which are the flat cells that form most of the epidermis (the outer layer of the skin). In actinic keratosis, the abnormal cells are …
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Basal cell carcinoma (BCC) is the most common type of skin cancer. It starts from basal cells, which are found in the deepest layer of the epidermis (the outer layer of the skin) and in hair follicles. Under the microscope, all basal cell carcinomas are made up of clusters of small, darkly stained cells called …
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Disordered proliferative endometrium is a non-cancerous change that affects the endometrium, which is the inner lining of the uterus. It develops when the endometrium is repeatedly exposed to estrogen without the balancing effect of progesterone. Under the microscope, the glands in the endometrium look irregular and disorganized, but the changes are not considered precancerous. If …
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A dermatofibroma, also called a benign fibrous histiocytoma, is a very common non-cancerous skin tumour. It develops from the dermis, the thick layer of connective tissue just below the surface of the skin. Dermatofibromas usually appear as small, firm bumps that may feel hard to the touch. They are most often found on the arms, …
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A congenital nevus is a common, non-cancerous skin tumour made up of melanocytes, cells responsible for producing melanin, the pigment that gives skin its colour. Congenital nevi (the plural of nevus) are usually present at birth or develop within the first year of life, which is why they are called “congenital.” Another name for this …
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A complex sclerosing lesion (CSL) is a benign (noncancerous) growth in the breast. Under the microscope, it has a central area of scar-like tissue with ducts and glands radiating outward, which is why it is sometimes referred to as a radial scar. Although the name includes the word “scar,” CSLs do not develop after injury …
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