Diagnostic Dilemma of a Neuroendocrine Tumour Complicated by Simultaneous Retroperitoneal Fibrosis and Carcinoid Heart Disease in a Perimenopausal Woman. - Rummun MA; Obazee N; Leung M; Rummun V; Shams A; Tariq Z; Nazarulla S; Khan I (Cureus, 2025)