MSFinals-5643
A 32-year-old female is initiated on haloperidol for treatment-resistant schizophrenia. She visits her primary care physician with a complaint of neck pain and limited neck movement for the past 24 hours. Upon examination, she displays normal vital signs except for a mild tachycardia of 105 and neck stiffness with restricted range of motion. Her neck is involuntarily flexed towards the right. Her facial movements are normal. What is the probable diagnosis?