A 46-year-old woman wanders into the clinic, rambling incoherently. When questioned, she has some difficulty remembering what she was asked. She exhibits some perceptual disturbances and is not oriented to time. Which of the following is the most likely diagnosis?

Six days ago, a 2-year-old boy had a temperature of 40.0°C (104.0°F). No specific cause was found. His fever has persisted and he now has injected conjunctivae, strawberry tongue, dry fissured lips, erythema and desquamation of his hands and feet, and bilateral cervical adenopathy. Which of the following is the most likely complication of this condition?

A 31-year-old African American woman has had worsening malaise, dyspnea, and low-grade fever for the past four weeks. She was recently treated for iritis. On physical examination, red nodules over the anterior lower legs and mild hepatomegaly are noted. Chest x-ray study shows bilateral hilar adenopathy. Which of the following is the most likely diagnosis?

For the past three weeks, a 47-year-old man has had the feeling of heaviness in his chest while pushing his lawn mower. He says he has never been treated before and is having no symptoms now. He smoked one pack of cigarettes daily for 20 years but quit smoking seven years ago. Findings on physical examination are normal. Electrocardiogram shows no abnormalities. Which of the following is the most appropriate initial diagnostic study?

A 54-year-old male is diagnosed with chronic pancreatitis. Of the following complications which is most commonly seen in association with this diagnosis?