Dr. Kostandinos Sideras is a hematology internist practicing in Rochester, MN. Dr. Sideras specializes in cases of suspected blood disorders when a diagnosis is unclear and further medical care is needed. Hematology internists work with other specialists such as surgeons, radiation therapists and gynecologists in order to get a better understanding on the cases. Often, patients are asked to participate in clinical research that could result in more efficient treatment methods.