Brain tumors can go undetected for a long time, depending on the type of tumor, its location, and its size. Benign (non-cancerous) brain tumors may not require treatment and can sometimes go unnoticed for years. Malignant (cancerous) tumors, however, can grow quickly and may cause symptoms that lead to an early diagnosis.
Low-grade gliomas, which are slow-growing brain tumors, may go undetected for months or even years. Symptoms may be so mild that they are mistaken for something else. If the tumor is located in an area of the brain that does not affect vital functions, it may not cause any noticeable symptoms.
High-grade gliomas, which are more aggressive, may grow quickly, leading to more severe symptoms that can prompt diagnostic testing. Symptoms such as headaches, nausea, and vomiting may cause a person to seek medical attention. Depending on the size and location of the tumor, it may be detected with imaging tests such as MRI or CT scans.
In some cases, a tumor may be present since birth, yet go undetected for years. For example, an infant may be born with a tumor in the brain, yet it may not cause any symptoms until the child is well into adulthood. In other cases, a tumor may be present for many years before it is discovered, making it difficult to determine how long it has been there.
Overall, the length of time a brain tumor can go undetected depends on a variety of factors, including the type and location of the tumor. Some tumors may be present from birth while others may go undiagnosed for years. Early diagnosis is important in order to start treatment and reduce the risk of complications. If you are experiencing any symptoms that could be related to a brain tumor, it is best to speak with your doctor for further evaluation.