22/04/2026
*Age-Wise Differential Diagnosis* of HSM
*Infants (Neonates and Young Infants)*
In this age group, the presence of jaundice is a major branching point for the differential
:
*Jaundiced HSM:*
Extrahepatic Biliary Atresia (EHBA): The most common cause of liver failure in this group; infants often look remarkably well despite the disease
*α 1 -Antitrypsin (AAT)* Deficiency: The most common inherited cause presenting in the neonatal period
*Alagille Syndrome* (Paucity of Interlobular Bile Ducts): Often presents with a characteristic "triangular" face and prominent forehead
*Infections*: TORCH (Toxoplasmosis, Rubella, CMV, Herpes/HIV) and E. coli urinary tract infections (UTIs)
*Metabolic:* Galactosemia, tyrosinemia, and cystic fibrosis (CF)
*Not Jaundiced HSM:*
*Tumors*: Hepatoblastoma or neuroblastoma deposits
*Storage Diseases:* Early manifestations of Glycogen Storage Diseases (GSD types 1, 3, and 6)
*Congestive*: Congestive heart failure (CCF)
*Preschool (Less than 5 Years)*
*Jaundiced*: Chronic Active Hepatitis (CAH), metabolic disorders (AAT, HFI, CF), and choledochal cysts
*Not Jaundiced*:
Infections: Viral hepatitis (A, B, C, E), EBV, CMV, and toxoplasmosis
*Metabolic*: Hereditary fructose intolerance (HFI) and cholesteryl ester storage disease
*Structural:* Congenital hepatic fibrosis and tumors
*School Age (5 Years and Older)*
Additions to the earlier groups that become more prevalent in older children include:
*Wilson Disease*: Should always be suspected in children >5 years with liver signs or haemolytic anaemia; Kayser-Fleischer rings are a diagnostic clue
*Chronic Active Hepatitis (CAH)*: May be associated with other autoimmune signs like thyroiditis or erythema nodosum
*Malignancy:* Hodgkin and non-Hodgkin lymphomas become more frequent
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*. Clinical Clues for the Short Case Examination*
Mnemonic *"SHIRT*": A useful tool to recall causes of hepatomegaly (often associated with HSM): Structural, Haematological, Infection, Reticuloendothelial/Rheumatological, Tumour/Trauma
Surgical Scars: A linear "Kasai" scar in the right upper quadrant suggests prior surgery for biliary atresia; a "Mercedes" scar indicates a liver transplant
Splenomegaly Consistency: A hard liver suggests cirrhosis; massive splenomegaly without a hard liver in an infant suggests a lysosomal storage disorder
Growth Charts: Stunted growth (short stature) is a common marker for chronic diseases like thalassaemia, Crohn's disease, or Shwachman-Diamond syndrome
