Cushing Syndrome Secondary to Ectopic ACTH Secretion by Dedifferentiated Acinic Cell Carcinoma of the Parotid GlandButt, Muhammad Imran MRCP; Rose, D Simon C. FRCPATH; Robinson, Anthony M. FRCPEndocrinologist: July/August 2008 - Volume 18 - Issue 4 - pp 161-162 doi: 10.1097/TEN.0b013e31817ffeb7 Case Report Abstract Author Information A 60-year-old man presented with an acute confusional state 2 months after parotidectomy for dedifferentiated adenocarcinoma of the parotid gland with nodal metastasis. Investigation indicated ectopic adrenocorticotropic hormone (ACTH) production from metastatic parotid carcinoma resulting in Cushing syndrome. Parotid gland adenocarcinoma is an extremely rare source of ectopic ACTH production with only 2 cases previously reported in the literature, both of which were conventional acinic cell carcinoma. This is a first case report of a dedifferentiated acinic cell carcinoma causing ectopic ACTH syndrome. From the Royal United Hospital, Bath, UK. Reprints: Dr Muhammad Imran Butt, MRCP, Specialist Registrar, Endocrinology, Royal United Hospital, Bath, BA1 3NG, UK. E-mail: firstname.lastname@example.org. © 2008 Lippincott Williams & Wilkins, Inc.