A tumour deposit is a group of cancer cells that has spread from the original tumour (primary tumour) to another location in the body. These cancer cells can spread locally, meaning they stay close to the primary tumour or travel to distant organs or tissues. When tumour cells spread to distant organs, the deposits are …
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Tumour regression refers to the reduction in size or complete disappearance of a tumour, either spontaneously or as a result of treatment. In pathology, tumour regression is assessed by examining tissue samples to determine the extent of the decrease in tumour cell population and changes in the tumour’s structure. What causes tumour regression? Treatment-induced regression …
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A tumour capsule is a thin layer of tissue that separates a tumour from the surrounding healthy tissue. Some tumours are completely surrounded by this capsule—these tumours are described as encapsulated. Tumours without a capsule are called non-encapsulated. Both benign (non-cancerous) and malignant (cancerous) tumours can have a capsule. What does capsule invasion mean? Pathologists …
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Solar elastosis is a non-cancerous skin condition caused by excessive and long-term exposure to sunlight or other sources of ultraviolet (UV) radiation. It is also known as actinic elastosis or photoaging. Doctors consider solar elastosis a clear sign of sun damage, which occurs after years of sun exposure. What causes solar elastosis? Solar elastosis is …
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A dermal nevus is a non-cancerous skin tumour made up of specialized cells called melanocytes. Melanocytes produce melanin, the pigment that gives skin its colour. The term “dermal” is used because the melanocytes in a dermal nevus are located in the dermis, a layer of skin below the surface. This type of growth is commonly …
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A compound nevus is a very common non-cancerous type of skin tumour made up of cells called melanocytes. This type of growth is more common in people with light-coloured skin but can be found anywhere on the body. Another name for a compound nevus is a mole, which is a common term used to describe …
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A junctional nevus is a non-cancerous skin tumour made up of specialized cells called melanocytes. Melanocytes produce melanin, the pigment that gives skin its colour. The term “junctional” is used because the melanocytes in a junctional nevus are located at the junction between the epidermis and the dermis. This type of growth is commonly called …
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Hematopoietic cells are responsible for producing all the different types of blood cells in the body. The term “hematopoietic” comes from the Greek words “hema,” meaning blood, and “poiesis,” meaning formation. The process of creating these cells is called hematopoiesis. These cells are essential for the continuous production of blood cells, including red blood cells (RBCs), white blood …
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An atypical carcinoid tumour is a type of lung cancer. It develops from special cells in the lungs called neuroendocrine cells. These cells normally produce hormones that help regulate breathing and airflow in the lungs. Atypical carcinoid tumours usually grow in the central area of the lung near the airways. When the tumour grows large …
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What is a typical carcinoid tumour of the lung? A typical carcinoid tumour is a slow-growing type of lung cancer made up of neuroendocrine cells. In the lung, this tumour starts from the neuroendocrine cells normally found in the walls of the airways and is often located in the central part of the lung near …
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