TY - JOUR T1 - Paraneoplastic hyperthyroidism JF - BMJ Case Reports DO - 10.1136/bcr.04.2011.4163 VL - 2011 SP - bcr0420114163 AU - Sibylle Kohler AU - Oliver Tschopp AU - Emanuel Jacky AU - Christoph Schmid Y1 - 2011/08/15 UR - http://casereports.bmj.com/content/2011/bcr.04.2011.4163.abstract N2 - The authors describe a 31-year-old male with a metastatic germ cell tumour and massively elevated human chorionic gonadotrophin (HCG) levels who presented with hyperthyroidism. As HCG is structurally closely related to thyroid stimulating hormone (TSH), it can activate the TSH receptor; grossly elevated levels may result in hyperthyroidism. After initiation of chemotherapy, HCG levels decreased and hyperthyroidism resolved. ER -