Giant Ectopic Parathyroid Adenoma Arising in the Posterior Mediastinum. Report of Case and a Review

Figure 3

(a) Photomicrograph featuring thin fibrous capsule (arrows) and clusters and nests of chief epithelial cells with clear cytoplasm and rounded monotonous nuclei. The stroma shows vascularized connective tissue (H&E X 40). (b) Photomicrograph featuring tumor nests within fibrotic stroma (double headed arrows) with adjacent cystic areas (asterisk) surrounded by clusters of tumor cells. The cysts are filled with granular secretions. No necrotic tissue is present (H&E X 40). (c) Histological section of parathyroid adenoma featuring clusters and nests of benign epithelial cells with uniform rounded nuclei and water clear cytoplasm. The stroma contains few fat cells (arrows) (H&E X 200). (d) Histological section of parathyroid adenoma featuring clusters and nests of benign epithelial chief cells (arrows) with uniform rounded nuclei and water clear cytoplasm (H&E X 400).

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