Immunohistochemical and morphometrical evaluation of well-differentiated thyroid tumor of uncertain malignant potential.

Context: Well-differentiated tumor of uncertain malignant potential (WDT-UMP) were encapsulated follicular pattern tumors with diffuse equivocal or focal unequivocal papillary thyroid carcinoma (PTC) type nuclear changes without definite invasion. These tumors are suggested to be borderline in its nature. Immunohistochemistry by CD56, P63, and CK19 are common markers used in differentiation between benign and malignant thyroid tumor.