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The histologic appearance of the nodule of tissue removed from the cranial pole of the left lobe of the thyroid gland of a 10-year-old, spayed female, beagle-cross dog with persistent hypercalcemia. The central, well demarcated, pale stained mass was diagnosed as a parathyroid gland adenoma. Note the increased cellularity at one edge of the mass (arrow). The mass was surrounded by normal thyroid gland follicles. Hematoxylin and eosin stain; bar = 1 mm.
