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Gastrointestinal stromal tumors are a disease in which malignant (cancer) cells form in the tissues of the wall of the stomach or intestines. Gastrointestinal stromal tumors (GIST) usually begin in cells in the tissues of the wall of the stomach or intestines. These cells, called interstitial cells of Cajal, help...
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Childhood bladder cancer is a very rare type of cancer that forms in the tissues of the bladder. The bladder is a hollow, balloon-shaped organ in the lower part of the abdomen that stores urine. The bladder has a muscular wall that allows it to get larger to store urine...
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Testicular tumors in children can form in the tissue of one or both testicles. These tumors can be benign (not cancer) or malignant (cancerous). Benign tumors do not spread to other parts of the body. However, they may grow and press on nearby tissues, causing discomfort or other problems. Malignant...
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Childhood ovarian tumors form in the tissues of the ovaries. Most ovarian tumors in children are not cancer. Ovarian cancer in children is very rare but occurs most often in females aged 15 to 19 years. The ovaries are a pair of organs in the female reproductive system. They are...
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Childhood extracranial germ cell tumors start in germ cells in parts of the body other than the brain. A germ cell is a type of cell that forms as a fetus develops. These cells later become sperm in the testicles or eggs in the ovaries. This summary is about germ...
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Oral complications are common in cancer patients, especially those with head and neck cancer. Complications are new medical problems that occur during or after a disease, procedure, or treatment and that make recovery harder. The complications may be side effects of the disease or treatment, or they may have other...
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Multiple endocrine neoplasia (MEN) syndromes are inherited disorders that affect the endocrine system. The endocrine system is made up of glands and cells that make hormones and release them into the blood. MEN syndromes may cause hyperplasia (the growth of too many normal cells) or tumors that may be benign...
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Childhood cervical and vaginal cancers are very rare types of cancer. Cervical cancer forms in the cells of the cervix, and vaginal cancer forms in the cells of the vagina. The cervix is the lower, narrow end of the uterus (the hollow, pear-shaped organ where a fetus grows). The cervix...
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Pheochromocytoma forms in the adrenal gland. Pheochromocytoma forms in the adrenal gland. There are two adrenal glands, one on top of each kidney in the back of the upper abdomen. Each adrenal gland has two parts. The outer layer of the adrenal gland is the adrenal cortex. The center of...
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Intraocular melanoma is a disease in which malignant (cancer) cells form in the tissues of the eye. Intraocular melanoma begins in the middle of three layers of the wall of the eye. The outer layer includes the white sclera (the "white of the eye") and the clear cornea at the...