49-year-old man with small-cell lung carcinoma was admitted because of syncope.

A 30-year-old woman with coma

Fever and abdominal pain

61-year-old man presented with a reddish brown rash in his groin ;

A 50-year-old man with abdominal pain

66-year-old man was evaluated for recurrent cardiac decompensation and a 2- year history of worsening heart failure.

39-year-old man was brought to the emergency department with altered mental status

87-year-old woman with iatrogenic cushing’s syndrome presented with fever and shock.

50-year-old woman with abdominal pain and vomiting

12-year-old boy with acute myelogenous leukemia that had been diagnosed two months earlier presented to a hospital with fever and leg pain.

27-year-old man was admitted to the emergency department because of respiratory failure.

20-year-old man was admitted to the hospital with a one-day history of fever and acute, painful symmetric polyarthritis

80-year-old woman presented with a three-day history of passage of bright red blood from the rectum.

35-year-old woman presented with a three-day history of sore throat, painful swelling of the neck, fever, rigor, hemoptysis, and dyspnea.

19-year-old man without a history of asthma or allergies presented to the emergency department with difficulty in breathing.