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.

A 45-year-old woman with sudden-onset epigastric pain, nausea, and vomiting.

A 45-year-old woman with several days of dyspnea and fever.

A 77-year-old woman with right-sided abdominal pain.

A 4-year-old boy with months of headaches, increasing in frequency.

A 55-year-old woman with painless swelling in the right thigh.

A 66-year-old woman with severe pain after awkwardly twisting her knee.

A 38-year-old woman immediately postoperative with shortness of breath.

A 28-year-old man with acute worsening of scrotal swelling.

A 19-year-old man with shortness of breath and a sore throat.

A 52-year-old man with increasing abdominal pain.

A 22-year-old woman with bilateral neck swelling and difficulty swallowing.