Light microscopy of a liver biopsy from a patient with beta-thalassemia–related secondary iron overload. Hematoxylin and eosin stained tissue demonstrates widespread iron deposition within hepatocytes and Kupffer cells (siderosis), evidenced by coarse brown pigments concentrated in the cytoplasm. The hepatic architecture shows portal tracts with mild-to-moderate portal fibrosis and the development of fibrous septa bridging portal regions. Within these septa, ductular proliferation is evident, indicating a ductular reaction to chronic injury. Iron deposition begins in Kupffer cells and progressively involves hepatocytes, a pattern characteristic of secondary hemochromatosis due to transfusional iron overload rather than primary hereditary iron overload. The parenchyma retains overall lobular organization but shows increasing fibrogenesis and periportal architectural remodeling. These histologic features correlate with systemic iron loading, risk of progressive fibrosis, portal hypertension, and potential progression to cirrhosis if iron chelation therapy is not optimized. Clinically, this pattern helps distinguish from primary hemochromatosis, where hepatocytes are involved earlier and Kupffer cell iron deposition is less prominent in early stages. In beta-thalassemia, management focuses on iron chelation, monitoring liver iron concentration, ferritin, and liver function, with ongoing assessment of fibrosis progression via repeat biopsy or noninvasive imaging. This image is educational for hematology–liver pathology and transplant hepatology.

Imaging modality: Gross pathology photography of an excised liver. Specimen: whole liver with transection showing nodular surface. Anatomical location: hepatic parenchyma within the right and left lobes of the liver. The specimen demonstrates micronodular cirrhosis, a classic morphologic consequence of long-standing hereditary hemochromatosis (HFE-related), characterized by numerous small regenerative nodules that disrupt normal architecture. The color is variably brown to reddish-brown, reflecting iron deposition (siderosis) in hepatocytes and Kupffer cells; over time, periportal ferritin accumulates and parenchymal fibrosis progresses to cirrhosis with architectural remodeling and potential hepatocellular hyperplasia. The nodularity is coarse, with a nodular surface evident on gross inspection; the cut surface may show fibrous septa and regions of regenerative nodules. In hereditary hemochromatosis, iron overload begins in periportal hepatocytes and spreads to hepatocytes and bile ducts, correlating with disease stage. The clinical significance includes risk of progressive fibrosis, portal hypertension, cirrhosis, hepatocellular carcinoma, and liver failure if untreated. This image is valuable for education about genotype–phenotype correlations (classic HFE-related HH in susceptible populations), macroscopic liver pathology in iron overload, and gross-pathology correlation with histologic iron deposition. Potential clinical use cases: pathology teaching, radiologic-pathologic correlation, and comparative studies of cirrhotic nodularity.

Imaging modality: light microscopy of hematoxylin and eosin stained liver biopsy section (parenchyma). The liver tissue demonstrates secondary iron overload with heavy iron deposition (siderosis) primarily within Kupffer cells and extending into adjacent hepatocytes. At high magnification, dark brown to black granular and clumped pigment is evident within the cytoplasm of macrophages and hepatocytes; the pigment corresponds to hemosiderin and appears as coarse intracellular aggregates. The overall hepatic architecture is preserved with intact lobular arrangement; eventual expansion of sinusoids may be seen in iron overload. In this specimen, the distribution begins in the reticuloendothelial system (Kupffer cells) and progressively involves parenchymal hepatocytes, consistent with secondary hemochromatosis due to exogenous iron load from chronic transfusions, hemolysis, or dialysis. The pigment is best highlighted by iron-specific staining (Prussian blue) though not shown here; ferritin and transferrin saturation may be altered clinically. Pathologic implications include potential progression to fibrosis and cirrhosis if iron deposition is sustained. Clinically, this pattern helps distinguish secondary iron overload from hereditary hemochromatosis, where hepatocyte involvement can precede Kupffer cell iron loading. The image provides educational value for hepatology, pathology, and medical training in iron metabolism, siderosis, and iron-chelation decision-making. This feature underscores the need for chelation therapy assessment.

This is a liver biopsy histology image prepared with Hematoxylin and Eosin staining, viewed under brightfield microscopy at moderate to high magnification. The liver architecture shows preserved lobular arrangement but with evident iron deposition characteristic of secondary iron overload due to beta-thalassemia requiring chronic transfusions. Iron deposition is evident in both Kupffer cells (reticuloendothelial system) and hepatocytes (hepatocytic siderosis), creating conspicuously dense, variably aggregates of granular, coarse ferritin/hemosiderin pigment within cytoplasm. The portal tracts display early portal fibrosis with formation of septa bridging across lobules, consistent with progressing siderotic liver disease. Sinusoidal congestion may be present; there is no overt steatosis or ballooning change described. The staining highlights iron presence; if Prussian blue were performed, iron deposits would appear blue and confirm hemosiderosis. The observed pattern—Kupffer cell predominance early, with later hepatocytic involvement—aligns with secondary iron overload from transfusion-dependent anemia (beta-thalassemia) rather than primary hereditary hemochromatosis. Clinically, this correlates with chronic transfusion therapy and risk of fibrosis, cirrhosis, and liver dysfunction. These features underscore the diagnostic significance of hepatic iron quantification and histopathologic scoring to guide chelation therapy and monitor hepatic injury. Correlation with ferritin trends and liver function tests is essential for treatment planning.

Clinical photographs of a 65-year-old male demonstrating systemic skin hyperpigmentation, a characteristic finding in hereditary hemochromatosis (bronze diabetes). Panel A shows the face and upper chest with a speckled, mottled pattern consisting of numerous small dark macules and patches. Panel B displays the trunk and dorsal surfaces of the hands; the torso exhibits generalized tanning with uneven pigment distribution, and the hands show prominent hyperpigmentation relative to the forearms. Panel C illustrates the lower extremities, where the hyperpigmentation is most pronounced on the distal aspects of the feet and toes, appearing as a dark brownish-purple hue. The legs show a scattered, mottled pigmentary pattern. These visual signs, combined with the patient's history of liver cirrhosis and diabetes, represent the classic 'bronzing' of the skin due to systemic iron overload and increased melanin production. The presentation is medically significant for the diagnosis of secondary or hereditary hemochromatosis involving iron deposition in various organs.

This composite educational image illustrates clinical and pathological features of hereditary hemochromatosis. Image A is a clinical photograph of a male patient demonstrating generalized skin hyperpigmentation, often referred to as 'bronze' coloration. A side-by-side comparison with the patient’s own hand highlights the marked contrast between the tanned, metallic hue of the facial skin and a more typical Caucasian skin tone. The sclerae also appear to show slight icteric or pigmented changes. Image B is a gross pathology photograph showing a dissected organ, the pancreas, which exhibits a characteristic dark, black-greyish discoloration. This color change is a result of extensive parenchymal iron deposition (hemosiderosis) common in advanced iron overload syndromes. The tissue appears rigid and shows signs of inflammatory disruption, surrounded by vascular congestion and fluid. Together, these images illustrate 'bronze diabetes,' the classic triad of hyperpigmentation, diabetes mellitus (via pancreatic damage), and cirrhosis associated with chronic iron overload in hereditary hemochromatosis.

A multi-panel figure illustrating the clinical and radiological manifestations of juvenile hereditary hemochromatosis. Panels (a) and (b) are clinical photographs showing focal skin hyperpigmentation: (a) demonstrates speckled, slight pigmentation on the anterior tibia of the lower limbs, while (b) shows more diffuse, uniform dark pigmentation on the left hand compared to the right. Panels (c) through (f) display MRI diagnostic images highlighting systemic iron overload. In (c) and (f), axial abdominal MRI scans reveal significantly reduced T2 signal intensity in the liver and spleen (indicated by white arrows), appearing as 'black matter lesions' characteristic of excessive iron deposition. Panel (d) shows an axial cardiac MRI with low myocardial signal (arrow), indicating cardiac iron involvement. Panel (e) is a sagittal cranial MRI demonstrating decreased signal intensity within the pituitary gland (arrow). These visual findings collectively teach the multi-organ impact of iron overload, affecting the skin, liver, heart, and endocrine system in a clinical syndrome associated with HAMP gene mutations.

This clinical photograph displays a female neonate in a supine position, illustrating generalized hyperpigmentation of the skin. The pigmentation is diffuse and relatively uniform across the face, torso, and extremities, presenting as a deep bronze or dark brown hue. The skin texture appears smooth without visible primary lesions, rashes, or mottling. Key clinical features include the absence of visible jaundice or cyanosis, although the intense pigmentation can mask subtle vascular changes. An identification band is visible on the upper left arm, and a diaper is in place. In a neonatal context, such progressive, generalized hyperpigmentation is a significant clinical sign often associated with endocrine disorders, specifically primary adrenal insufficiency (such as Congenital Adrenal Hyperplasia), where elevated levels of adrenocorticotropic hormone (ACTH) lead to increased melanocyte stimulation. This image serves as an educational tool for recognizing systemic manifestations of metabolic and endocrine pathologies in pediatrics.

This diagnostic image is an axial T2* magnetic resonance imaging (MRI) scan of the thorax, specifically focusing on the cardiac region. The image demonstrates the heart in a cross-sectional view, surrounded by the lungs and posterior vertebral structures. Two white arrows indicate localized areas of significant low signal intensity (hypointensity) within the myocardial wall. These dark regions are characteristic of iron overload or hemosiderosis, as iron deposits cause rapid T2* relaxation and subsequent signal loss. The clinical significance of this finding relates to the assessment of cardiac iron deposition in patients with secondary hemochromatosis or chronic transfusion requirements. The lungs appear dark due to low proton density and air content, while the chest wall and subcutaneous fat provide a brighter peripheral signal. This modality is the gold standard for non-invasive quantification of myocardial iron, aiding in the diagnosis of iron-overload cardiomyopathy.

This composite educational graphic illustrates the diagnosis and treatment response of Iron Overload Cardiomyopathy (IOC) in a patient with primary hemochromatosis. Panel A presents a standard twelve-lead electrocardiogram (ECG) showing atrial flutter with a ventricular rate of approximately 105 beats per minute and non-specific T-wave inversions in the lateral leads (V4-V6), indicative of conduction abnormalities. Panels B and C show Cardiac Magnetic Resonance (CMR) short-axis views with T2* mapping for myocardial iron quantification. Panel B (baseline) demonstrates darkened myocardial signal intensity, particularly in the left ventricle, corresponding to moderate iron loading (T2* value of 12–13 ms) and significant hepatic iron overload. Panel C (12-month follow-up) shows the same anatomical view after iron chelation therapy with adjunctive amlodipine. The improved signal intensity in the myocardium (T2* of 26 ms) indicates a successful reduction in iron deposition and restoration of near-normal myocardial tissue characteristics, correlating with improved systolic and diastolic function.

This diagnostic image display consists of two panels (a and b) showing Cardiac Magnetic Resonance (CMR) scans of two different patients with C282Y homozygous hereditary hemochromatosis. Each panel provides a comparison between 'Baseline with heart failure' and 'After venesection' states, captured during both end-diastole and end-systole. The CMR views include the horizontal long axis (top row), mid-ventricular short axis (middle row), and vertical long axis (bottom row). At baseline, the images demonstrate features of dilated cardiomyopathy: a globally enlarged, more spherical left ventricle (LV) with thinned myocardial walls and significantly reduced systolic wall thickening, correlating with a low Left Ventricular Ejection Fraction (LVEF). Post-venesection images show marked clinical improvement, characterized by a reduction in LV chamber size, more conical ventricular morphology, and increased myocardial wall thickening during systole, indicating recovered LVEF. The scans illustrate the reversibility of iron-overload induced cardiac dysfunction through iron removal therapy (venesection), providing a visual representation of improved myocardial T2* values and ventricular remodeling.