Inclusion Criteria:  Adult patients living or deceased of either sex (age ≥18 years) with a documented FD diagnosis in the last 10 years from the beginning of the study. Patients with at least 3 years of follow-up or early occurrence of severe/fatal outcomes. Also, adult patients who were lost by their care provider or physician and cannot be traced, but for which it is possible to retrieve data for at least 3 years before the last available follow-up visit or from diagnosis to the occurrence of severe/fatal outcomes if earlier, can be included. Written informed consent to undergo in the cross-sectional protocol clinical visit and to retrospectively collect genetic/clinical data. In case of deceased or untraceable patients, the written informed consent is not required to collect retrospective clinical data (excluding genetic data).  Exclusion Criteria:  Not applicable