Parathyroid Adenoma with Prominent Lymphocytic Infiltrate

Figure 1

Encapsulated homogenous lesion, composed of clear type chief cells of a microfollicular pattern in delicate capillary network, accompanied by multiple, scattered foci of dense lymphocytic infiltrates with formation of follicles with fully developed germinal centers ((a): HE ×100). Small foci with glandular destruction due to lymphocytic infiltration highlighted by staining with CK8/18 ((b): IHC ×200).

(a)

(b)