PT - JOURNAL ARTICLE AU - Ansha Goel AU - Freba Farhat AU - Chad Zik AU - Michelle Jeffery TI - Triphasic response of pituitary stalk injury following TBI: a relevant yet uncommonly recognised endocrine phenomenon AID - 10.1136/bcr-2018-226725 DP - 2018 Oct 24 TA - BMJ Case Reports PG - bcr-2018-226725 VI - 2018 4099 - http://casereports.bmj.com/content/2018/bcr-2018-226725.short 4100 - http://casereports.bmj.com/content/2018/bcr-2018-226725.full AB - The triphasic response of pituitary stalk injury has previously been described in a minority of patients following intracranial surgery, however, this phenomenon can also occur after traumatic brain injury. We present the case of a 20-year-old male who experienced the triphasic response of pituitary stalk injury (central diabetes insipidus, syndrome of inappropriate antidiuretic hormone and central diabetes insipidus again) after striking his head on a concrete curb. His history and presentation highlight the importance of recognising the distinctive symptoms of each individual stage of pituitary stalk injury, and using the appropriate diagnostic tools and therapies to guide further management.