A 16-year-old boy arrives in a Texas hospital emergency room in a semiconscious state. He was transported there after collapsing during football practice.

A previously healthy 30-year-old man notices difficulty completing his usual exercise routine over the last 2 weeks because of excessive fatigue during the workout.

An 18-month-old boy, with a high fever and cough and with a history of frequent infections, is brought to the emergency department by his father. A blood examination shows elevated numbers of neutrophils but no other defects.

A 15-year-old girl sees her family physician for a routine school athletic physical. Upon routine examination, her physician detects a reasonably loud systolic murmur when placing her stethoscope parasternally around the second and third intercostal spaces, but her physical exam is otherwise unremarkable.

An 8-year-old girl was diagnosed with type 1 diabetes. Nausea and vomiting, symptoms of ketoacidosis, which is not uncommon, were accompanied by polyuria, polydipsia, polyphagia, weight loss, and blurred vision.

Recovering from a heart attack and fighting pneumonia, a 65-year-old Vietnam veteran was transferred from the VA hospital to the university hospital to be evaluated for surgery to repair his blocked arteries.

A 6-year-old boy is brought to the pediatrician by his mother because of a puffy face and lethargy. A few weeks before, he had an upper respiratory tract infection, probably caused by a virus.

A previously healthy girl presented at age 10 years with anorexia, abdominal distention, abdominal pain, vomiting, and severe constipation that failed to respond to large doses of laxatives.

It was mid-August in San Antonio, another week of consecutive greater than 90°F days with high humidity.

A 20-year-old male patient presented with lack of sexual development. On examination, he was eunuchoidal and hypogonadal, and olfactory function testing showed he was anosmic.