Type B1 thymoma is a rare tumour that starts in the thymus, a small organ located in the chest. The thymus plays an important role in developing the immune system, especially during childhood. Type B1 thymomas contain many lymphocytes, a type of white blood cell, and the tumour cells resemble normal thymic epithelial cells. This type of thymoma …
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A type AB thymoma is a tumour that forms in the thymus, an organ in the upper chest that is part of the immune system. These tumours contain a mix of two types of cells: the spindle-shaped epithelial cells seen in type A thymomas and the lymphocytes (white blood cells) more commonly associated with Type B thymomas. This …
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A smooth muscle tumour of uncertain malignant potential (STUMP) is a rare type of tumour that arises in the smooth muscle of the uterus. These tumours are considered “uncertain” because it is difficult to determine whether they are benign (non-cancerous) or malignant (cancerous) based on their appearance under the microscope. STUMP falls somewhere between a …
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Myofibroblastoma is a rare, non-cancerous tumour that develops from the connective tissue of the breast. It is made up of cells called fibroblasts and myofibroblasts, which are normal cells involved in wound healing and tissue repair. Although myofibroblastomas most commonly form in the breast, they can also appear in other parts of the body, including …
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Background: An elastofibroma is a rare, benign (noncancerous) growth that usually develops in the soft tissues near the shoulder blades. It is made up of a mixture of fibrous tissue (similar to scar tissue) and abnormal elastic fibers (the fibers that give skin and other tissues their stretchiness). Elastofibromas are most often found in older …
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The term fibromyxoid tumour is not a final diagnosis but a descriptive term that pathologists sometimes use when looking at tissue under the microscope. It refers to tumours made up of a mix of fibrous tissue (tough, scar-like tissue) and myxoid tissue (a gelatin-like material). These tumours can be benign (noncancerous) or malignant (cancerous). They …
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Canalicular adenoma is a benign (noncancerous) type of salivary gland tumour. It most commonly arises in a minor salivary gland, such as those in the lip and oral cavity (palate, gingiva, floor of mouth). It is a rare tumour, representing about 1% of all salivary gland tumours. What are the symptoms of a canalicular adenoma? …
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Alveolar soft part sarcoma (ASPS) is a rare soft-tissue cancer that develops in the muscles, fat, or connective tissue of the body. Despite its name, it does not start in the alveoli of the lungs. Instead, the term “alveolar” refers to the way the tumor cells are arranged under the microscope. The cells tend to …
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A cellular leiomyoma is a noncancerous tumour that develops in the muscular wall of the uterus, called the myometrium. Leiomyomas are composed of smooth muscle cells, which are the same type of cells that normally comprise the myometrium. The tumour is called cellular because it contains more muscle cells than the surrounding normal tissue. Cellular …
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Hyalinizing clear cell carcinoma (HCCC) is a slow-growing type of head and neck cancer. A genetic alteration involving the EWSR1 gene is found in most tumours. This type of cancer is typically found in minor salivary glands in the lip, tongue, buccal mucosa (inner cheeks), gingiva (gums), hard and soft palate (the roof of the …
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