WorksheetsEpidemiology of Hemochromatosis
Total questions: 98
Worksheet time: 49mins
Which statement best describes the prevalence of hereditary hemochromatosis in populations of Northern European descent?
It is a rare genetic disorder with fewer than 1 in 10,000 affected.
It is the most frequent genetic disease in the white population, especially common in those of Northern European descent.
It primarily affects people of Asian descent and is uncommon in Europe.
It occurs equally across all global populations with identical frequency.
At approximately what total body iron level do symptoms of hemochromatosis typically begin to appear?
> 5 g
> 10 g
> 20 g
> 50 g
Why do women typically develop symptomatic hemochromatosis later than men?
Women have lower dietary iron intake than men.
Iron accumulation is slowed before menopause due to iron loss via menstruation and pregnancy.
Women have genetically lower absorption of iron from the gut.
Women are more frequently heterozygous, delaying onset.
Which statement best describes the classical and most frequent form of primary hemochromatosis?
Adult hemochromatosis type I
Neonatal hemochromatosis type II
Juvenile hemochromatosis type III
Transfusion-related hemochromatosis
The common genetic defect in primary hemochromatosis type I involves which gene?
HFE gene
HLA-B27 gene
β-globin gene
CFTR gene
Where is the HFE gene located?
Chromosome 6
Chromosome 9
Chromosome 11
Chromosome 21
Primary hemochromatosis type I most commonly involves mutations designated as which of the following?
C282Y and H63D
V617F and BCR-ABL
ΔF508 and G551D
JAK2 and CALR
What is the inheritance pattern of primary (hereditary) hemochromatosis type I?
Autosomal recessive with incomplete penetrance
Autosomal dominant with full penetrance
X-linked recessive
Mitochondrial inheritance
Secondary hemochromatosis is primarily caused by which overarching mechanism?
Iron overload
Copper deficiency
Vitamin C toxicity
Reduced erythropoiesis
Which clinical situation is a classic transfusion-related cause of secondary iron overload?
Beta-thalassemia major requiring chronic transfusion
Acute dehydration treated with IV fluids
Pneumonia treated with antibiotics
Type 1 diabetes requiring insulin
Ineffective erythropoiesis leading to secondary iron overload includes which condition?
Thalassemia
Asthma
Hypothyroidism
Rheumatoid arthritis
Excessive alcohol consumption contributes to secondary hemochromatosis primarily because it does what?
Increases the absorption of iron
Decreases iron excretion in sweat
Causes copper accumulation
Reduces gastrointestinal motility
Which gene primarily regulates iron homeostasis in normal physiology?
HFE
CFTR
APOE
BRCA1
TP53
In hemochromatosis type I, a homozygous defect in the HFE gene most directly leads to which immediate consequence in the liver?
Increased hepcidin synthesis
Decreased hepcidin synthesis
Increased transferrin production
Decreased ferroportin expression
Increased bile secretion
Decreased hepcidin in hereditary hemochromatosis results in what effect on enterocyte ferroportin and intestinal iron absorption?
Ferroportin is downregulated, decreasing absorption
Ferroportin is upregulated, increasing absorption
Ferroportin is unchanged, but absorption decreases
Ferroportin is degraded, normalizing absorption
Ferroportin is internalized, decreasing absorption
According to the diagram comparing normal vs. hemochromatosis type I, which downstream changes are characteristic of the disease state?
Normal plasma iron and no organ injury
Decreased iron release from macrophages and enterocytes
Increased plasma iron with accumulation in organs causing free radical injury
Increased hepcidin leading to reduced transferrin saturation
Reduced ferritin with decreased iron stores
Which statement best differentiates hereditary hemochromatosis from secondary hemochromatosis regarding hepcidin levels?
Both conditions cause increased hepcidin at onset
Hereditary hemochromatosis features decreased hepcidin, while secondary hemochromatosis shows increased hepcidin immediately after transfusion
Secondary hemochromatosis always presents with decreased hepcidin regardless of liver status
Hereditary hemochromatosis features increased hepcidin due to HFE mutation
Hepcidin levels are irrelevant in both conditions
What is the mechanistic link between defective binding of transferrin to its receptor (due to HFE gene defect) and organ damage?
Defect increases hepcidin, causing anemia and organ atrophy
Defect decreases hepcidin, leading to unregulated ferroportin, increased intestinal iron absorption, body iron accumulation, and damage to affected organs
Defect directly increases reactive oxygen species independent of iron
Defect reduces ferroportin expression, preventing iron efflux and causing iron deficiency
Defect increases bile acids that injure organs
Which organ complications are specifically illustrated as outcomes of iron accumulation in hemochromatosis type I in the diagram?
Pulmonary fibrosis, nephrotic syndrome, stroke
Liver cirrhosis, diabetes, cardiomyopathy
Hypothyroidism, dermatitis, osteoporosis
Acute pancreatitis, peptic ulcer disease, epilepsy
Cataracts, glaucoma, hearing loss
Which statement best describes a hepatic lobule?
A circular unit formed by bile canaliculi only
A roughly hexagonal structural unit in the liver separated from adjacent lobules by connective tissue
A triangular unit centered on a portal triad
A spherical cluster of Kupffer cells with no vasculature
Within each hepatic lobule, what separates the plates of hepatocytes?
Central veins
Hepatic sinusoids
Bile ducts
Lymphatic channels
What structures are arranged together at the vertices of the hepatic lobule to form the portal triad?
Central vein, hepatic artery branch, lymphatic vessel
Hepatic vein, bile duct, sinusoid
Branches of the hepatic artery and portal vein with bile ducts
Hepatic artery, hepatic vein, portal canaliculi
Based on the diagram of the hepatic lobule, which labeled structure lies at the center and receives mixed blood from the sinusoids?
Interlobular vein
Bile duct
Central vein
Branch of hepatic artery
How does blood flow through a hepatic lobule?
From the central vein outward to portal triads via sinusoids
From peripheral portal triads toward the central vein, mixing in sinusoids
From bile ducts into sinusoids then to the portal vein
From hepatic artery branches directly to the hepatic vein without mixing
Which structure forms a network between hepatocytes to drain bile toward the portal triads?
Liver sinusoids
Bile canaliculi
Central vein
Hepatic artery branches
Space of Disse
In a hepatic lobule, what is the direction of bile flow relative to the central vein and portal triads?
Peripheral to central, same as blood flow
Central to peripheral, opposite to blood flow
Peripheral to central, opposite to blood flow
Central to peripheral, same as blood flow
Based on the labeled diagram of a hepatic lobule, bile collected by canaliculi ultimately drains into which structure within the portal triad?
Branch of portal vein
Interlobular bile duct
Central vein
Liver sinusoid
Hepatic vein
Which labeled vascular channel carries blood through the hepatic lobule and runs adjacent to hepatocyte plates, distinct from the bile canaliculi?
Bile duct
Liver sinusoid
Central vein
Interlobular bile duct
Branch of hepatic artery
Which feature of hepatic sinusoids permits plasma to enter the perisinusoidal space?
Continuous endothelium
Highly fenestrated endothelium
Thick basement membrane
Tight junctions between endothelial cells
Ciliated endothelium
Microvilli on which surface of hepatocytes increase surface area for efficient substance exchange?
Apical surface
Basolateral surface
Basal surface only
Apical-lateral junctions
Canalicular surface only
Adjacent hepatocyte apical surfaces form channels that ultimately drain into interlobular bile ducts. What are these channels called?
Hering canals
Bile canaliculi
Sinusoids
Perisinusoidal clefts
Portal venules
In the labeled diagram of hepatic microstructure, which cell type resides within the sinusoidal lumen and functions as a macrophage?
Ito cell
Kupffer cell
Cholangiocyte
Endothelial cell
Hepatocyte
What is the primary role of hepatocyte microvilli projecting into the perisinusoidal space?
Initiate bile secretion directly into sinusoidal blood
Anchor hepatocytes to the basement membrane
Increase surface area to enhance substance exchange
Generate contractile force to propel bile
Form tight junctions with Kupffer cells
Which pairing correctly matches the structure with its location as shown in the diagram?
Bile canaliculus—within the sinusoidal lumen
Perisinusoidal space—between sinusoidal endothelium and hepatocytes
Kupffer cell—embedded within the hepatocyte cytoplasm
Ito cell—floating free in portal venous blood
Discontinuous endothelium—lining bile ducts
Which term is another name for the hepatic stellate cell (HSC)?
Kupffer cell
Ito cell
Cholangiocyte
Hepatocyte
In their normal (quiescent) state, where are Ito cells located?
Inside bile canaliculi
Within hepatic arterioles
In the space of Disse between hepatocytes and sinusoidal endothelial cells
Embedded in the portal triad lymphatics
What is the primary function of quiescent Ito cells?
Phagocytosis of pathogens
Storage of vitamin A in lipid droplets
Bile production
Ammonia detoxification
During chronic liver injury, Ito cells become activated. Into which phenotype do they transform?
Endothelial-like cells
Neutrophil-like cells
Myofibroblast-like cells
Cholangiocyte-like cells
Which outcome is most directly linked to persistent activation of Ito cells?
Acute hepatic necrosis
Steatosis reversal
Cirrhosis due to excess collagen (mainly type I and III) and fibrosis
Increased bile secretion
What proportion of hemochromatosis cases are asymptomatic?
25%
50%
75%
90%
Which set best represents common early general symptoms of hemochromatosis?
Dyspnea and chest pain
Fatigue/lethargy with arthralgia and impotence
Seizures and visual loss
Weight gain and constipation
Patients with hemochromatosis have increased susceptibility to infections primarily due to pathogens that exploit which host condition?
Hypocalcemia
Iron overload
Hyperglycemia
Dehydration
Which pathogen pair from the options is specifically noted as exploiting iron overload in hemochromatosis?
Streptococcus and Influenza virus
Listeria and Pseudomonas
Giardia and Varicella zoster virus
Mycobacterium tuberculosis and HIV
Which liver manifestation is associated with hemochromatosis and increases the risk of death through hepatocellular carcinoma, even in the absence of another condition?
Steatosis; requires cirrhosis first
Cirrhosis; carcinoma risk increases only with cirrhosis
Hepatomegaly; carcinoma risk unrelated
Hepatocellular carcinoma risk increases even without cirrhosis
Which of the following is an organ-specific pancreatic manifestation of hemochromatosis?
Acute pancreatitis
Diabetes mellitus with polydipsia and polyuria
Exocrine pancreatic insufficiency
Pancreatic pseudocyst formation
A patient with hemochromatosis develops bronze skin. Which mechanism contributes to this finding in addition to iron deposition?
Decreased melanin production due to iron toxicity
Increased melanin production via pro-inflammatory activity of iron
Carotene accumulation in the dermis
Bilirubin deposition in the skin
Which triad best summarizes liver-related clinical features of hemochromatosis presented in the material?
Abdominal pain, hepatomegaly, cirrhosis
Ascites, portal vein thrombosis, jaundice
Hepatic encephalopathy, variceal bleeding, steatosis
Pruritus, cholangitis, gallstones
Which pituitary-related manifestation is listed among organ-specific symptoms in hemochromatosis?
Hyperthyroidism
Hypogonadism
Hyperprolactinemia
Acromegaly
Cushing syndrome
A male patient with hemochromatosis presents with decreased sexual desire. Which associated pituitary symptom best explains this finding?
Testicular atrophy
Galactorrhea
Hypertension
Gigantism
Polycythemia
Joint involvement in hemochromatosis typically includes which pattern?
Asymmetrical arthropathy of the wrist only
Symmetrical arthropathy of the MCP joints II and III
Monoarthritis of the knee
Symmetrical arthropathy of the ankle joints
Asymmetrical arthropathy of the shoulders
Chondrocalcinosis in hemochromatosis is described as the accumulation of which substance?
Magnesium sulfate
Uric acid
Calcium pyrophosphate
Sodium oxalate
Potassium phosphate
Cardiomyopathy due to cardiac siderosis in hemochromatosis can lead to which remodeling outcome?
Only hypertrophic cardiomyopathy
Only restrictive cardiomyopathy (irreversible)
Dilated (reversible) or restrictive cardiomyopathy
Isolated right ventricular hypertrophy
Myocarditis with preserved ejection fraction
Which arrhythmia is identified as most common in cardiac involvement of hemochromatosis?
Ventricular fibrillation
Paroxysmal atrial fibrillation
Atrial flutter
Junctional rhythm
Torsades de pointes
In which clinical contexts does cardiomyopathy from cardiac siderosis most commonly occur?
Iron deficiency anemia and pregnancy
Iron overload due to hereditary hemochromatosis or repeated blood transfusions
Viral myocarditis in childhood
Autoimmune disease and thyroid storm
Chronic kidney disease with hypocalcemia
Which laboratory threshold indicates extreme hyperferritinemia warranting urgent therapeutic phlebotomy without waiting for genetic testing?
Serum ferritin > 300 ng/mL
Serum ferritin > 1,000 ng/mL
Transferrin saturation > 45%
Serum iron above reference range
For diagnosing iron overload, which serum ferritin cutoff applies to premenopausal patients?
>= 100 ng/mL
>= 200 ng/mL
>= 300 ng/mL
>= 500 ng/mL
In suspected iron overload, which combination of laboratory changes is most characteristic?
Decreased serum ferritin, increased total iron-binding capacity, decreased serum iron
Increased serum ferritin, increased transferrin saturation, increased serum iron, decreased total iron-binding capacity
Normal serum ferritin, increased total iron-binding capacity, normal transferrin saturation
Increased serum ferritin, decreased transferrin saturation (<45%), increased total iron-binding capacity
Which transferrin saturation value supports a diagnosis of iron overload?
≥ 15%
≥ 30%
≥ 45%
≥ 60%
Which test change is expected in iron overload regarding total iron-binding capacity (TIBC)?
TIBC increases
TIBC decreases
TIBC remains unchanged
TIBC becomes unreliable
Which additional laboratory finding may accompany hemochromatosis-related iron overload?
Decreased hepatocellular enzymes (AST, ALT)
Increased hepatocellular enzymes (AST, ALT)
Normal hepatocellular enzymes with leukopenia
Elevated alkaline phosphatase only
A complete blood count (CBC) may identify which related condition in the context of iron overload evaluation?
Iron-deficiency anemia
Hemolytic anemia
Iron-loading anemia (e.g., sideroblastic anemia)
Megaloblastic anemia
Which imaging modality is used to estimate hepatic iron concentration (HIC) in suspected hemochromatosis?
CT abdomen with contrast
MRI abdomen without contrast
Ultrasound elastography
PET-CT
A key role of MRI abdomen in hemochromatosis is to help distinguish between which two conditions based on hepatic iron pattern?
Primary biliary cholangitis vs. autoimmune hepatitis
Hereditary hemochromatosis vs. secondary iron overload
Alcoholic liver disease vs. NAFLD
Acute hepatitis vs. chronic hepatitis
Based on symptoms, which imaging tests can be used to evaluate cardiac manifestations such as cardiomyopathy in hemochromatosis?
Echocardiogram and/or cardiac MRI, and X-ray chest
PET-CT and coronary calcium scoring
Abdominal ultrasound and Doppler
Ventilation–perfusion scan
Which modality is appropriate to evaluate joint manifestations, for example arthritis of the second and third MCPs, in patients with hemochromatosis?
DEXA scan
Plain radiography
CT arthrogram
Bone scintigraphy
On MRI, the liver in hemochromatosis is described as which of the following, relative to normal tissue signal?
Hyperintense on all sequences
Isointense to paraspinal musculature
Hypointense on both gradient echo and Express sequences
Variable with no consistent pattern
In the provided MRI example, liver signal intensities of 33 and 158 are compared with paraspinal musculature values of 394 and 307. What conclusion does this support?
There is no iron accumulation
Paraspinal musculature accumulates iron
Lower hepatic signal is consistent with hemochromatosis
Muscle signal should be used to diagnose fibrosis
Which tissue is noted as not accumulating iron and serves as a reference when calculating a signal intensity ratio?
Spleen
Paraspinal musculature
Pancreas
Renal cortex
What ratio can be used on MRI to determine hepatic iron concentration in hemochromatosis?
Spleen to pancreas signal intensity ratio
Heart to lung signal intensity ratio
Liver to muscle signal intensity ratio
Kidney to spleen signal intensity ratio
In a patient with suspected hereditary hemochromatosis who is homozygous for the HFE C282Y mutation, which additional finding would specifically indicate the need for a liver biopsy?
Serum ferritin level > 1000 ng/mL
Transferrin saturation < 20%
Elevated ceruloplasmin
Normal liver enzymes
Which clinical scenario justifies a liver biopsy in a homozygous HFE C282Y patient besides very high ferritin?
Presence of additional risk factors for cirrhosis
Evidence of iron deficiency anemia
Normal abdominal ultrasound
Asymptomatic status only
For patients without homozygous HFE C282Y mutation, what is a stated role of liver biopsy?
Routine screening for hemochromatosis in all adults
Staging fibrosis or investigating an alternative cause of liver disease
Monitoring response to phlebotomy every 3 months
Measuring serum ferritin directly
Which histologic substance appears blue with the Prussian blue stain on liver biopsy in hemochromatosis?
Bilirubin
Hemosiderin
Lipofuscin
Glycogen
Which pattern best characterizes hereditary hemochromatosis on liver histology?
Kupffer cells laden with hemosiderin
Prominent parenchymal siderosis in hepatocytes and bile duct epithelium
Portal lymphoid aggregates without iron
Sinusoidal amyloid deposition
On liver biopsy, iron accumulation within Kupffer cells is most consistent with which condition?
Hereditary hemochromatosis
Wilson disease
Secondary iron overload
Alpha-1 antitrypsin deficiency
What key information about hepatic iron can limit the need for liver biopsy in hemochromatosis because it can be assessed by a noninvasive test?
Iron concentration and distribution pattern via MRI
Presence of cirrhosis via CT angiography
Serum ferritin via ultrasound
HFE genotype via PET scan
Which statement best reflects the limitation of liver biopsy in hemochromatosis?
It cannot detect hemosiderin with histologic stains
It is unnecessary because MRI can assess concentration and distribution of hepatic iron
It cannot be performed in patients with elevated ferritin
It fails to sample hepatocytes
In the photomicrograph using Prussian blue stain, which color indicates iron deposits in the liver tissue?
Bright red
Dark blue
Light green
Brown
A liver biopsy stained with Prussian blue shows brightly red-stained structures scattered among cells. What are these structures?
Iron deposits
Bile canaliculi
Nuclei
Kupffer cells
On an H&E-stained high-magnification liver biopsy, which finding supports iron accumulation within hepatocytes?
Diffuse pale cytoplasm
Coarse granular brown pigment within cells
Uniform blue cytoplasmic granules
Bright red nuclei without cytoplasmic pigment
Which pairing correctly matches the stain with its characteristic appearance of iron in liver tissue?
Prussian blue: coarse granular brown pigment; H&E: dark blue iron deposits
Prussian blue: dark blue iron deposits; H&E: coarse granular brown pigment
Prussian blue: bright red iron deposits; H&E: pale yellow iron deposits
Prussian blue: colorless iron deposits; H&E: green iron deposits
Which statement best describes the indication of therapeutic phlebotomy in hereditary hemochromatosis?
It is reserved for end-stage disease only
It is the first-line treatment, including for asymptomatic patients
It is used only when ferritin exceeds 1000 ng/mL
It is contraindicated in all genetic cases
In which scenario should therapeutic phlebotomy be considered for secondary iron overload?
Patients with symptomatic porphyria cutanea tarda
Patients with iron-deficiency anemia
Patients with acute blood loss
Patients with normal iron studies
Which of the following is a contraindication to therapeutic phlebotomy?
Elevated serum ferritin
Low hemoglobin due to iron-loading anemia
Asymptomatic hereditary hemochromatosis
Porphyria cutanea tarda with symptoms
A patient has conditions sensitive to fluid shifts. Which example from the list would make therapeutic phlebotomy relatively contraindicated?
Type 2 diabetes mellitus
Congestive heart failure
Gastroesophageal reflux disease
Osteoarthritis
During the initial phase of therapeutic phlebotomy, which regimen aligns with the guidance?
About 250 mL removed monthly; ferritin goal below 20 ng/mL
About 500 mL removed weekly over 1–2 sessions; ferritin goal 50–100 ng/mL
About 750 mL removed weekly for 8 weeks; ferritin goal 100–200 ng/mL
About 500 mL removed once yearly; ferritin goal 200–300 ng/mL
What is the typical maintenance-phase target and frequency after initial iron depletion by phlebotomy?
Serum ferritin 200 ng/mL; monthly phlebotomy
Serum ferritin about 50 ng/mL; 3–4 sessions per year of about 500 mL each
Serum ferritin 100–200 ng/mL; weekly sessions
Serum ferritin below 20 ng/mL; daily sessions
Which scenario is an indication for iron chelation therapy?
Primary treatment for all cases of hereditary hemochromatosis regardless of response to phlebotomy
First-line treatment for secondary iron overload due to iron-loading anemia
Routine prevention of iron overload in healthy adults
Management of acute blood loss anemia
A patient with hereditary hemochromatosis has contraindications to phlebotomy. What is the most appropriate next consideration?
Begin erythropoietin therapy
Consider iron chelation therapy
Start high-dose vitamin C
Recommend iron supplementation
Which of the following lists only recognized iron chelating agents discussed in the material?
Deferoxamine, deferasirox, deferiprone
Deferiprone, ferritin, hepcidin
Deferasirox, phlebotomy, erythropoietin
Deferoxamine, desferrioxamine, ferric carboxymaltose
Which important consideration is specifically emphasized before administering chelating agents?
Check liver enzymes due to hepatotoxicity risk
Check renal function because of nephrotoxicity and renal accumulation risk
Check coagulation profile due to bleeding risk
Check thyroid function due to hypothyroidism risk
Which statement best reflects cost and safety considerations of iron chelation therapy?
Low cost with minimal adverse effects
High cost with significant risk of adverse effects
Moderate cost with rare adverse effects
High cost but negligible monitoring needs
In patients with hemochromatosis, which supplement should be avoided as part of dietary changes?
Iron and vitamin C supplements
Calcium and vitamin D supplements
Folic acid supplements only
Magnesium supplements only
According to recommended dietary measures for hemochromatosis, what is the guidance regarding dietary iron?
Reduce all dietary iron to a minimum
Eliminate heme iron only
No need to reduce dietary iron
Increase dietary iron to support erythropoiesis
Which lifestyle recommendation is emphasized for individuals with hemochromatosis?
Strict avoidance of alcohol
Routine consumption of red wine
Avoidance of caffeine
Increase in vitamin C–rich beverages
What is a noted effect of proton pump inhibitors (PPIs) relevant to hemochromatosis management?
They increase iron absorption
They decrease iron absorption
They mobilize stored iron
They replace the need for phlebotomy
How should PPIs be positioned in the treatment plan for hemochromatosis?
First-line monotherapy for all patients
Adjunct to phlebotomy, used only when there is another indication for PPIs (e.g., GERD)
Used only in patients with iron deficiency anemia
Reserved for patients without any gastrointestinal symptoms
Which statement best reflects an application of the guidance on PPIs in hemochromatosis?
Start a PPI in every patient to prevent iron absorption regardless of comorbidities
Consider a PPI as an adjunct in a patient who already requires therapy for GERD
Discontinue phlebotomy when a PPI is initiated
Avoid PPIs because they universally worsen iron overload
