A 58-year-old man presented with a five-day history of severe lower right abdominal pain, fever, and diarrhea.

A 79-year-old man with cancer presented with nausea, vomiting, and abdominal pain in the emergency department.

A 48-year-old man without significant past medical history with multiple days of worsening chest pain.

A 40-year-old woman with headaches and focal neurologic deficits including numbness and tingling in her hands and feet.

A 57-year-old woman with chronic shortness of breath, worsening over the past several months.

A 76-year-old man with left scapular pain that radiated to the shoulder, axilla, and proximal left upper extremity.

A 22-year-old man with subacute abdominal pain and diarrhea.

A 55-year-old woman with several months of behavioral disturbances.

A 51-year-old man was found down and without a pulse.

An 18-year-old woman with severe abdominal pain centered around the umbilicus.

A 26-year-old man with two years of intermittent and progressive sharp left foot pain.

A 74-year-old woman with chronic, nonproductive cough for months' duration.

A 63-year-old man -- a former smoker with a 20-pack-year smoking history -- with worsening dyspnea.

A patient with abdominal pain out of proportion to the exam.

A 39-year-old man with several months of abdominal pain, now with acute worsening.

An 83-year-old woman with a history of prior tobacco use and pulmonary mycobacterial infection.

A healthy 15-year-old boy with a two-week history of a persistent, productive cough.

An 80-year-old man with altered mental status and new-onset seizure one week after a fall.

A 20-year-old man with an incidentally noted painless testicular mass.

A 38-year-old man with history of prior left-sided stroke who experienced an episode of sudden unresponsiveness.