They are usually found in the trunk of the body and the limbs. Lipoblastoma also called lipoblastomatosis develops in babies and young children. It is an unusual type of lipoma made up of immature fat cells.
Hibernoma tends to grow slowly. It usually develops in the chest thorax. It can also develop in the trunk of the body, limbs and back of the abdomen retroperitoneum. Fibroma is a general term used to describe a group of non-cancerous tumours that start in the skin or fibrous soft tissues, such as tendons and ligaments.
Fibromas are usually slow-growing tumours. Elastofibroma is a rare non-cancerous tumour that grows slowly. Elastofibromas usually develop between the lower part of the shoulder blade and the chest wall. They tend to happen in older adults and are thought to be caused by repetitive manual tasks.
These tumours can grow to 5 to 10 cm in diameter. Superficial fibromatosis is when small non-cancerous tumours develop in the tissues of the hands, feet or penis. These tumours tend to grow slowly. Superficial fibromatosis is most common in a hand and is called palmar fibromatosis. When it happens in a foot, it is called plantar fibromatosis. When it happens in the penis, it is called penile fibromatosis. The tumours are more likely to develop in the feet or penis if they have already happened in the hands.
They are likely to come back after they are removed. Desmoid-type fibromatosis is a soft tissue tumour that is usually non-cancerous. It tends to come back after treatment and grow into invade nearby tissue. It often starts in the arms, legs or abdomen. Deep benign fibrous histiocytoma forms in the tissue deep under the skin usually in the legs or head and neck area.
It is a slow-growing, painless lump. When a benign fibrous histiocytoma starts in the layers of the skin, it is often called a dermatofibroma. Non-cancerous muscle tumours happen most often in smooth involuntary muscle. They may also develop in skeletal voluntary muscle. Leiomyomas are non-cancerous tumours that develop in smooth muscle. They often happen as many painful lumps. Leiomyomas can start almost anywhere in the body but are most common in the gastrointestinal GI tract and uterus.
A leiomyoma that develops in the uterus is also called a fibroid. Privacy Policy Terms of Use. Twitter Facebook. This Issue. Views 59, Citations 0. View Metrics. What Is a Tumor? Benign Tumors. Malignant Tumors. The information and recommendations appearing on this page are appropriate in most instances, but they are not a substitute for medical diagnosis. For specific information concerning your personal medical condition, JAMA Oncology suggests that you consult your physician.
This page may be photocopied noncommercially by physicians and other health care professionals to share with patients. To purchase bulk reprints, email reprints jamanetwork. Back to top Article Information. Limit characters. Limit 25 characters. Conflicts of Interest Disclosure Identify all potential conflicts of interest that might be relevant to your comment. Err on the side of full disclosure.
Yes, I have potential conflicts of interest. No, I do not have potential conflicts of interest. Limit characters or approximately words. The following information is required and must be completed in order to submit a comment:. Thank You. Your comment submission was successful. Please allow up to 2 business days for review, approval, and posting. Nevi, or moles, are types of benign tumors that may never need treatment.
Other types of benign tumors include:. The only way to be certain if a tumor is benign or malignant is with a pathology examination. While benign tumors rarely become malignant, some adenomas and leiomyomas may develop into cancer and should be removed. Desmoid tumors and fibroids also may cause damage if they are allowed to grow and may require surgery or a polypectomy. But while benign tumors may require some treatment, the cells that form them share few of the characteristics of aggressive cancer cells, Dr.
Then it learns how to proliferate. Then it learns how to invade. Then it learns to metastasize. Cells are the building blocks of cancer. Still wondering, what exactly is cancer? Learn more. Make a difference in the fight against cancer by donating to cancer research. Call us anytime. What's the difference? Other types of benign tumors include: Adenomas : These bumps form on the surfaces of G-I tract.
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