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A benign tumor is a mass of cells that does not invade neighboring tissue or metastasize (spread throughout the body). Compared to malignant (cancerous) tumors, benign tumors generally have a slower growth rate. Benign tumors have relatively well differentiated cells.
Grading in cancer is distinguished from staging, which is a measure of the extent to which the cancer has spread. Pathology grading systems classify the microscopic cell appearance abnormality and deviations in their rate of growth with the goal of predicting developments at tissue level (see also the 4 major histological changes in dysplasia ).
M9052/0 Epithelioid mesothelioma, benign Well differentiated papillary mesothelioma, benign; mesothelial papilloma; M9052/3 Epithelioid mesothelioma, malignant or NOS M9053/3 Mesothelioma, biphasic, malignant or NOS M9054/0 Adenomatoid tumor, NOS M9055/0 Multicystic mesothelioma, benign Cystic mesothelioma, benign; M9055/1 cystic mesothelioma, NOS
well-differentiated neuroendocrine tumors, further subdivided into tumors with benign and those with uncertain behavior; well-differentiated (low grade) neuroendocrine carcinomas with low-grade malignant behavior; poorly differentiated (high grade) neuroendocrine carcinomas, which are the large cell neuroendocrine and small cell carcinomas.
A lipoma is a benign tumor made of fat tissue. [1] ... Histopathology of the major differential diagnosis of a well-differentiated liposarcoma, lipoma-like subtype ...
Prognosis again is dependent on the spread of the tumor, as well as how differentiated the tumor appears. The overall prognosis is somewhat worse than for serous or mucinous tumors, and the 5-year survival rate for patients with tumors confined to the ovary is approximately 75%.
Biologically benign gliomas [WHO grade I] are comparatively low risk and can be removed surgically depending on their location [49] Low-grade gliomas [WHO grade II] are well-differentiated (not anaplastic); these tend to exhibit benign tendencies and portend a better prognosis for the patient. However, they have a uniform rate of recurrence and ...
Gleason scores range from 2 to 10, with 2 representing the most well-differentiated tumors and 10 the least-differentiated tumors. Gleason scores have often been categorized into groups that show similar biologic behavior: low-grade (well-differentiated), intermediate-grade, moderate to poorly differentiated or high-grade. [5]