• Patients must have a confirmed diagnosis of LAL Deficiency. An Informed Consent and Authorization must be obtained prior to patient enrollment where required under applicable laws and regulations, or a waiver must be obtained by the Institutional Review Board/Independent Ethics Committee.

• Patients cannot be currently participating in an Alexion-sponsored clinical trial. Patients who have concluded participation in an Alexion-sponsored sebelipase alfa clinical trial are eligible to enroll in this Registry, and enrollment in the Registry will not exclude a patient from enrolling in a future clinical trial.