What is a corpus luteum cyst? A corpus luteum cyst is a non-cancerous fluid-filled growth in the ovary. These types of cysts are very common in women of reproductive age. What causes a corpus luteum cyst? The corpus luteum is a normal structure that remains in the ovary after ovulation. It is made up of …
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What are cystic follicles and follicle cysts in the ovary? Cystic follicles and follicle cysts are related non-cancerous changes commonly seen when the ovary of a reproductive-age woman is examined under the microscope. Both are created by the growth of a normal structure called a follicle that did not release its ovum (egg) during the …
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What is a bile duct hamartoma? A bile duct hamartoma, also known as a von Meyenburg complex, is a non-cancerous liver tumour made up of disorganized bile ducts. It is a common type of liver tumour seen in approximately 3-6% of the population. Some may appear before birth during the time in fetal development when …
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A Schneiderian papilloma is a noncancerous (benign) tumor that arises from the tissue lining the nasal cavity and paranasal sinuses. Another name for it is sinonasal papilloma. Pathologists divide Schneiderian papillomas into three types, called inverted, exophytic, and oncocytic, based on how the tumor looks under the microscope. A Schneiderian papilloma is not a cancer, …
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Immunoreactivity is a term pathologists use to describe how cells or tissues respond to a special laboratory test called immunohistochemistry (IHC). In this test, antibodies are applied to a tissue sample to look for specific proteins. If the protein being tested is present, the antibody will attach to it, and the cells will change color …
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In pathology, a tangentially sectioned tissue sample is one cut at an angle rather than straight across. When a sample is cut at an angle, the layers of tissue overlap in the thin slice placed on the microscope slide. This can make the sample difficult to interpret, and sometimes it prevents the pathologist from seeing …
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Background: Deep fibromatosis or desmoid tumour is a benign (non-cancerous) type of tumour that starts in connective tissue. It is considered locally aggressive because it can grow into surrounding tissues and organs. The tumour can also grow back if not completely removed. However, it will not metastasize (spread) to other body parts. Other names for …
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Squamous cell carcinoma is the most common type of cancer that starts in the oral cavity, the medical name for the mouth. It begins in squamous cells, the thin, flat cells that form the inner lining of the mouth. It can develop anywhere in the oral cavity, including the front two-thirds of the tongue, the …
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Barrett esophagus is a change in the lining of the lower esophagus, the muscular tube that carries food and liquid from the mouth to the stomach. The esophagus is normally lined by squamous cells, flat, tough cells built to withstand the wear of swallowing. In Barrett esophagus, these are replaced by glandular cells of the …
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Atypical endometrial hyperplasia (AEH) is a precancerous condition of the lining of the uterus, called the endometrium. In AEH, the endometrium becomes abnormally thick and the glandular cells that make up the endometrium start to grow in a crowded and irregular pattern. The cells also look abnormal under the microscope, which is why the word …
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