A 51-year-old woman had intense and worsening polyarthralgia and swelling of bilateral fingers and toes 1 year after kidney transplant complicated by Volvariella volvacea infection of the central nervous system. Her medications included tacrolimus, prednisolone, cinacalcet, and voriconazole. Alkaline phosphatase level was elevated, and radiography of the hands revealed periostitis. What is the diagnosis and what would you do next?
Source: JAMA Online First