International Registry for Patients With Castleman Disease

Inclusion Criteria: * Person of any age * Have a reference pathology report suggesting "Castleman disease" not limited to cutaneous involvement only that can be uploaded * Be able to provide electronic informed consent, as per local regulations * Deceased patients may also be enrolled when a reference pathology report suggesting "Castleman disease" can be supplied or when the ART is able to locate and upload such a pathology report. Exclusion Criteria: * Because this registry is designed to provide as wide a picture of routine clinical practice as possible, inclusion criteria are set deliberately wide and there are no exclusion criteria.