Nonencapsulated tumors tend to infiltrate brain tissue
These tumors can arise in any part of brain connective tissue and infiltrate primarily cerebral hemisphere tissue. These tumors grow rapidly and are difficult to excise completely. The tumors described are classified as
a. angiomas.
b. pituitary adenomas.
c. meningiomas.
d. gliomas.
D
Gliomas are nonencapsulated; tend to infiltrate brain tissue; arise in any part of brain connective tissue; infiltrate primarily cerebral hemisphere tissue; are not well outlined, so they are difficult to excise completely; and grow rapidly. Most persons live months to years after diagnosis. Tumors are assigned grade from I to IV, with IV being most malignant. Angiomas arise from vascular structures and are usually difficult to resect. Pituitary adenomas arise from various tissues. A surgical approach is usually successful, and recurrence is possible. Meningiomas arise from meningeal coverings of brain. They are usually benign but may undergo malignant changes. They are usually encapsulated. Surgical cure is possible but so is recurrence.
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