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Long-standing GERD confers greatest increased risk for which esophageal pathology?

A 21-year-old with fever, headache, photophobia, and neck stiffness has CSF: WBC 650 (90% neutrophils), protein 300, glucose 28 (serum glucose 95). Most consistent with:

Painful clusters of vesicles on an erythematous base that ulcerate on the labia majora; recurrent episodes. Best confirmatory test?

A gravida 2, para 0 woman is Rh-negative; her first pregnancy ended at 20 weeks with an Rh-positive fetus. She now presents at 10 weeks with a viable Rh-positive pregnancy. Which statement best explains the role of Rho(D) immune globulin (RhIg)?

A 62-year-old with advanced dementia is asked to copy a simple design. He repeatedly draws the same line over and over despite prompts to stop. This behavior best represents:

Why does invasive cervical cancer most commonly arise at the transformation zone?

A 67-year-old receives an inactivated influenza vaccine. Two weeks later, serum shows a surge of antigen-specific antibodies with increasing affinity. Which effector cell directly produces these antibodies?

A 49-year-old woman with fatigue, weight gain, cold intolerance, and a firm, non-tender goiter is found to have elevated TSH and low free T4. Which serology best supports the most likely diagnosis?

Mood disorders are most associated with dysregulation of which neurobiologic system?

Brief vertigo (10–20 s) triggered by rolling in bed or looking up; Dix-Hallpike elicits torsional upbeat nystagmus. The mechanism is most consistent with: