Fever with Hepatosplenomegaly in Children Aged 0-2 Years

Immediate Life-Threatening Causes to Rule Out First

In infants and young children aged 0-2 years presenting with fever and hepatosplenomegaly, serious bacterial infections, hemophagocytic lymphohistiocytosis (HLH), and congenital infections are critical diagnoses that require urgent evaluation and treatment, according to the American College of Emergency Physicians 1
Only 58% of infants with bacteremia or bacterial meningitis appear clinically ill, so appearance alone cannot be relied upon, as stated by the American Academy of Pediatrics 1, 2
Urinary tract infection (UTI) has a prevalence of 3-7% in febrile children aged 2 months to 2 years without obvious source, higher in girls (6.5-8.1%) and uncircumcised boys, as reported by the American Academy of Pediatrics 3
Pneumonia occurs in 7% of febrile children under 2 years and can present with minimal respiratory symptoms initially, according to the American College of Emergency Physicians 4, 2
For infants 1-3 months old, bacterial meningitis remains a critical consideration requiring cerebrospinal fluid evaluation, as stated by the American Academy of Pediatrics 5, 2

Cytomegalovirus (CMV) and other congenital infections present with hepatosplenomegaly in this age group, according to the American College of Emergency Physicians 1

Infantile neurovisceral Acid Sphingomyelinase Deficiency (ASMD/Niemann-Pick Disease) presents at 6 months with marked abdominal distension, severe hepatosplenomegaly, failure to thrive, and chronic diarrhea, as reported by the American College of Medical Genetics and Genomics 6
Chronic visceral ASMD may present with isolated splenomegaly at routine visits in the first 2 years, according to the American College of Medical Genetics and Genomics 6
Diagnosis of ASMD requires enzyme assay for acid sphingomyelinase activity and genetic testing of SMPD1 gene, as stated by the American College of Medical Genetics and Genomics 6

Visceral Larva Migrans (Toxocariasis) usually seen in children under 5 years through ingestion of contaminated soil, presents with fever, eosinophilia, dyspnea, wheeze, cough, hepatosplenomegaly, and urticarial rash, as reported by the Infectious Diseases Society of America 7

Document rectal temperature ≥38.0°C (100.4°F) and assess for toxic appearance, respiratory distress, altered consciousness, or signs of shock, as recommended by the American College of Emergency Physicians 1, 2
Urine testing with leukocyte esterase, nitrites, leukocyte count, or Gram stain for UTI should be performed, according to the American Academy of Pediatrics 5
Blood culture before starting antibiotics is necessary, as stated by the American College of Emergency Physicians 5
Abdominal ultrasound to characterize hepatosplenomegaly and assess for masses or lymphadenopathy should be considered, as reported by the American College of Medical Genetics and Genomics 6
For infants 1-3 months: strongly consider lumbar puncture as there are no reliable predictors to exclude meningitis in well-appearing febrile infants, according to the American Academy of Pediatrics 5, 2

Never assume a well-appearing child cannot have serious bacterial infection or HLH, as stated by the American College of Emergency Physicians 1, 2
Do not overlook metabolic storage disorders in infants with chronic progressive hepatosplenomegaly and developmental concerns, according to the American College of Medical Genetics and Genomics 6
Remember that viral infections can coexist with bacterial infections, as reported by the American Academy of Pediatrics 2