Study duration per participant is between 1 and 12 months
Primary Objective:~To estimate the prevalence of Gaucher disease and of other etiologies, in patients of 15 years old or more presenting with unexplained splenomegaly after exclusion of first intention-diagnoses (e.g. portal hypertension, diagnosis or suspicion of haematological malignancy, haemolytic anemia) based on basic physical and biological exams (e.g. full blood count, liver enzymes, reticulocytes)~Secondary Objective:~To describe the exams and tests conducted for diagnosis purpose and the more frequent associations