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Hemosiderin image of a kidney viewed under a microscope. The brown areas represent hemosiderin. Hemosiderin or haemosiderin is an iron-storage complex that is composed of partially digested ferritin and lysosomes. The breakdown of heme gives rise to biliverdin and iron. [1] [2] The body then traps the released iron and stores it as hemosiderin ...
Hemosiderin deposition in the lungs is often seen after diffuse alveolar hemorrhage, which occurs in diseases such as Goodpasture's syndrome, granulomatosis with polyangiitis, and idiopathic pulmonary hemosiderosis. Mitral stenosis can also lead to pulmonary hemosiderosis. Hemosiderin collects throughout the body in hemochromatosis.
Hemosiderin hyperpigmentation is pigmentation due to deposits of hemosiderin, and occurs in purpura, haemochromatosis, hemorrhagic diseases, and stasis dermatitis. [ 1 ] : 853 See also
Fat deposits/swelling in legs and arms not in hands or feet; hands and feet may be affected as the disease progresses. Fat deposits / swelling widespread in legs/arms/torso: Fat deposits/swelling in one limb including hands and feet: Fat deposits widespread Swelling near ankles; brownish discoloration of lower legs (hemosiderin deposits).
Histopathology of the liver, showing Kupffer cells with significant hemosiderin deposition (shown next to a hepatocyte with lipofuscin pigment, which is a common normal finding). H&E stain. Prussian blue iron staining, highlighting the hemosiderin pigment as blue. This finding indicates mesenchymal iron overload (within Kupffer cells and/or ...
The stain is an important histochemical stain used to demonstrate the distribution and amount of iron deposits in liver tissue, often in the form of a biopsy. [6] [7] Perls's procedure may be used to identify excess iron deposits such as hemosiderin deposits (hemosiderosis) and in conditions such as hereditary hemochromatosis. [8]
The characteristic brown coloration results from hemosiderin deposition into the osteolytic cysts. Hemosiderin deposition is not a distinctive feature of brown tumors; it may also be seen in giant cell tumors of the bone. [2] [3] Brown tumors may be rarely associated with ectopic parathyroid adenomas [4] or end stage renal osteodystrophy. [5]
Red blood cell extravasation and deposition of hemosiderin that follows clinically appear as hyperpigmentation, which can occur in a reticular distribution. It has also been proposed that the distribution of affected blood vessels—predominantly in the superficial subcutaneous plexus (found in the papillary dermis )—results in the net-like ...