Tumor the microscope. In general, grade I and


Tumor is an uncontrolled
growth of cancer cells in anypart of the body. Tumors are of different types
and havedifferent characteristics and different treatments1. Atpresent, brain
tumors are classified as primary braintumors and metastatic brain tumors. The
former beginin the brain and tend to stay in the brain, the latter beginas a
cancer elsewhere in the body and spreading to thebrain.Brain tumors are divided
into two types: benign andmalignant. In fact, themost widely used grading
schemehas been issued by the World Health Organization(WHO)2. It classifies
brain tumors into grade I to IVunder the microscope. In general, grade I and
grade IIare benign brain tumor (low-grade); grade III and gradeIV are malignant
brain tumor (high-grade). Usually,if low-grade brain tumor is not treated, it
is likelyto deteriorate to high-grade brain tumor. The 2012CBTRUS (Central
Brain Tumor Registry of the UnitedStates) Statistical Report has also showed
that braintumors are the second leading cause of cancer-relateddeaths in
children under age 20 and in males ages 20-39 (leukemia is the first) and the fifth
leading causeof cancer-related deaths in females ages 20-39. Anestimated 69 720
new cases of primary brain tumorswere expected to be diagnosed in 2013 and
includedboth malignant (24 620) and non-malignant (45 100)brain tumors. This
estimate is based on an applicationof age-sex-race-specific incidence rates
from the 2013CBTRUS Statistical Report using SEER and NPCRdata to project 2013
US population estimates for therespective age-sex-race groups
(www.abta.org/about-us/news/brain-tumor-statistics/). Therefore, brain tumorsare
seriously endangering people’s lives and earlydiscovery and treatment have
become a necessity. Inthe clinical aspect, treatment options for brain
tumorinclude surgery, radiation therapy or chemotherapy.Along with the advance
of medical imaging,imaging modalities play an important role in theevaluation
of patients with brain tumors and havea significant impact on patient care.