👉 A mastocytoma is a benign tumor that develops in the bone marrow. It can cause pain, swelling, and fatigue. Mastocytomas are usually small, but they can grow to be large. They are often found on bones or inside other organs such as the liver, spleen, or kidneys. If left untreated, they can spread to other parts of the body. This type of cancer is not very common, but it can be dangerous if left untreated.
