This is a Natural History study to characterize key aspects of the clinical course of late onset Lysosomal Acid Lipase (LAL) Deficiency/ Cholesteryl Ester Storage Disease (CESD).

The objective of this study is to characterize key aspects of the clinical presentation, disease phenotype and progression of patients with late onset Lysosomal Acid Lipase (LAL) Deficiency/ Cholesteryl Ester Storage Disease (CESD) including, but not limited to, age of presentation, onset of hepatomegaly, progression over time of liver function, and stability of lipid abnormalities.

Inclusion Criteria:

• Patients with late onset LAL Deficiency/ Cholesteryl Ester Storage Disease (CESD) who are 5 years of age or older and have required data points in their medical record

Exclusion Criteria:

• Required data points for inclusion are not available

Patients diagnosed with late onset LAL Deficiency/ Cholesteryl Ester Storage Disease (CESD).