Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Mevalonic aciduria ?
    ### Response:
    Mevalonic aciduria is the severe form of mevalonate kinase deficiency, a condition characterized by recurrent episodes of fever that typically begin during infancy. During these fever episodes, people with mevalonic aciduria may have an enlarged liver and spleen (hepatosplenomegaly), lymphadenopathy, abdominal pain, diarrhea, joint pain (arthralgia), and skin rashes.
    