Microscopic grading of pituitary tumors is of no clinical value, because it is not possible to predict which tumors will be aggressive and recur after surgical resection and which will be cured by the initial surgery. Comments Thyroid Tumors Thyroid tumors are classified as benign or malignant. Thyroid adenomas outnumber carcinomas, which account for less than 1% of all thyroid neoplasms. Thyroid carcinomas are a heterogeneous group of tumors that occur in many histologic forms. Papillary

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... oma accounts for approximately 80% of all such carcinomas, and along with follicular carcinoma, medullary carcinoma, and undifferentiated (anaplastic) carcinoma form the majority of all thyroid tumors seen in general surgical pathology practice. The grading of thyroid tumors is of relative limited clinical significance.