Brain Anatomy and Functions Each hemisphere is divided into four lobes: frontal, parietal, occipital, and temporal. Brain tumors located in the lobes are called supratentorial and tumors located in the cerebellum or brainstem are called infratentorial

Medical Definition of tumor: an abnormal benign or malignant new growth of tissue that possesses no physiological function and arises from uncontrolled usually rapid cellular proliferation — see cancer sense 1, carcinoma, sarcoma.“In the early stages, it rarely causes symptoms because the tumors often are located deep in the tissue.” ... Most commonly, soft tissue sarcomas feel like masses or bumps, which may be painful. If the tumor is in the abdomen, it may produce nausea or a sensation of fullness as well as pain, he says.

Tumour is the favoured spelling throughout the English-speaking world with the exception of the United States, where tumor is standard.If there are too many new cells, a group of cells, or tumor, can develop. Although some tumors are benign and consist of noncancerous cells, others are malignant. Malignant tumors are cancerous, and the cells can spread to other parts of the body.