Microphotography of operative material. Tinted with hematoxylin and eosine. Magnification ×400. (a) Hematoma wall is composed of fibrous connective tissue, sediment of hemosiderin, fragment of fat tissue, lymphoplasmocitary infiltration. (b) Hematoma wall is composed of fibrous connective tissue, vessels, small fragments of parathyroid gland tissue in fibrous tissue. (c) Tissue of parathyroidgland adenoma with focal hemorrhage.