Niemann-Pick type C disease (NPCD) is an autosomal recessive storage l
ipidosis due to a disorder of cholesterol esterification leading to th
e accumulation of sphingomyelin and cholesterol in the brain, liver, a
nd spleen. The disease is usually diagnosed when neurological symptoms
appear. We report an unusual presentation of NPCD in a young asymptom
atic adult with isolated nodular splenomegaly.