L.R. GAYSINA1, M.YU. NAZAROVA1, L.F. VOLKOVA2, A.A. ABAKUMOVA2  1Kazan (Volga region) Federal University, Kazan 2Healthcare unit of the Kazan (Volga region) Federal University, Kazan  Contact details: Gaysina L.R. — PhD (medicine), Associate Professor of the Department of Internal Diseases Address:18 Kremlevskaya St., Kazan, Russian Federation, 420008, tel.: +7-903-307-92-47, e-mail: leilag@inbox.ru  Insulinoma is a rather rare […]