Adenocarcinoma in situ (AIS) is a type of early-stage, non-invasive lung cancer. The term non-invasive refers to the fact that the cancer cells have not spread beyond the inner lining of the small air sacs (alveoli) within the lungs. To be classified as adenocarcinoma in situ, the tumour must be no larger than 3.0 centimeters …
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Columnar cell hyperplasia is a non-cancerous change that can occur in the small structures of the breast called terminal duct lobular units (TDLUs). In this condition, the glands (acini) inside the TDLU become slightly enlarged and are lined by more than two layers of tall, column-shaped cells. This increased layering of cells is what hyperplasia …
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Columnar cell change is a non-cancerous alteration that can occur in the small structures of the breast known as terminal duct lobular units (TDLUs). In this change, the tiny glands (acini) inside the TDLU become slightly enlarged and are lined by cells that are taller than usual, called columnar epithelial cells. In some cases, there …
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Olfactory neuroblastoma is a type of cancer that starts from cells normally found in a part of the nasal cavity called the cribriform plate (an area at the top of the nasal cavity and near the base of the skull). As the tumour grows it can extend into the paranasal sinuses, orbit (the space around …
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An adrenal cortical adenoma is a non-cancerous tumour that starts from the cells normally found cortex (outer layer) of the adrenal gland. Many adrenocortical adenomas are incidental because they do not produce any symptoms and are found when imaging of the abdomen or pelvis is performed for other reasons. Is an adrenal cortical adenoma a …
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Urothelial carcinoma in situ (CIS) is a type of non-invasive cancer that starts in the lining of the urinary tract. The urinary tract includes the bladder, kidneys, ureters, and urethra. “In situ” means that the cancer cells are only found in the urothelium (inner lining) and have not spread to deeper tissues. However, if not …
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What is a mitotically active cellular fibroma? A mitotically active cellular fibroma is a non-cancerous type of ovarian tumour. It develops from the stromal cells normally found inside the ovary. These tumours can range in size from less than 1.0 cm to over 20 cm. It is called a ‘mitotically active cellular’ fibroma because the …
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What is a cellular fibroma? A cellular fibroma is a non-cancerous type of ovarian tumour. It develops from the stromal cells normally found inside the ovary. These tumours can range in size from less than 1.0 cm to over 20 cm. It is called a ‘cellular’ fibroma because the density of tumour cells (the number …
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What is an ovarian fibroma? Ovarian fibroma is a non-cancerous type of ovarian tumour. It develops from the stromal cells normally found inside the ovary. These tumours can range in size from less than 1.0 cm to over 20 cm. What are the symptoms of an ovarian fibroma? Most ovarian fibromas do not cause any …
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An inflammatory polyp is a non-cancerous growth that forms on the inner lining of the colon or rectum. These polyps are caused by inflammation or tissue injury and are sometimes called pseudopolyps because they are not true neoplasms (tumours) but rather a reaction to damage. Inflammatory polyps can develop anywhere in the colon, but they …
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