A 55-year-old woman presents with 3 months of progressive stridor, orthopnea, and hoarseness following prolonged intubation 8 months ago after a motor vehicle accident. Spirometry with flow-volume loop analysis is performed. The curve marked **B** shows flattening of both the inspiratory and expiratory limbs, producing a rectangular "box-shaped" appearance with markedly reduced peak flows in both phases. Which of the following is the most likely diagnosis?
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