Brain tumors are neoplasms (an abnormal, new uncontrolled growth of tissue) that arise from within the skull. They can be broadly classified into either benign or malignant tumors.
Benign Brain Tumors
- Tend to grow more slowly
- The symptoms they elicit are usually present for a longer period of time
- Cells are well-differentiated (i.e. they look more like normal tissue)
- The risk of invasion into neighbouring tissue is typically low
- They often have a circumscribed surface
- Complete surgical resection reduces the risk of recurrence
Malignant Brain Tumors
- Tend to grow rapidly
- Cells are poorly-differentiated
- Symptoms often occur over a shorter period of time or present suddenly
- Tend to invade into neighbouring tissue or spread to remote areas
- Following surgery radiotherapy or chemotherapy (or both) is often required.
- The risk of recurrence is relatively higher