Parathyroid adenoma
Gross appearance of two parathyroid adenomas. Note the ovoid shape, the homogeneous appearance interrupted by a few foci of fresh hemorrhagic or cystic changes, and the brown to yellowish color.A: revealing clear delineation from the residual gland on the Rt. B: details of chief-cell parathyroid adenoma. There is slight variation in nuclear size and tendency to follicular formation but no anaplasia.
Solitary chief-cell parathyroid adenoma