A 47-year-old woman with a severe acute-onset headache.

A 78-year-old man with a progressively enlarging right neck mass.

A 66-year-old woman with one month of progressively worsening upper back pain.

A 25-year-old woman with long-standing back pain in the midthoracic region.

An 83-year-old man with coronary artery disease and a prior transient ischemic attack.

A 46-year-old man found down at home.

A 64-year-old man with prior prostate cancer.

A 23-year-old man with penetrating neck trauma undergoing vascular evaluation.

A 64-year-old unresponsive man found down at home.

A 28-year-old woman with left-sided numbness and weakness for two hours.

A 45-year-old woman with worsening headaches and confusion.

A 30-year-old woman with several days of sudden-onset numbness to her torso.

A 72-year-old woman with a history of bladder exstrophy and ureterosigmoidostomy now with urinary tract infection and confusion.

A 22-year-old woman with recurrent fevers, headaches, and nausea and vomiting.

A 56-year-old woman with slow cognitive decline.

A 1-year-old boy with a seven-day history of diarrhea and vomiting.

A 65-year-old woman with a long history of pulsatile tinnitus.

A 71-year-old man with dizziness and vertigo, numbness in the face and tongue, and pain when turning his head.

A 54-year-old woman with acute onset of short-term memory loss and left-sided paresthesia.

A 30-year-old woman with a history of cognitive impairment and seizures now with enlarging renal lesions.