A 7-year-old boy presents to the pediatric ENT clinic with intermittent ear fullness during air travel. Otoscopic examination reveals translucent pearly-gray tympanic membranes with clear light reflexes bilaterally and normal mobility on pneumatic otoscopy. Impedance audiometry is performed, and the tympanogram shown demonstrates a well-defined single peak centered at 0 daPa with peak static admittance of 0.8 mL on the right and 0.9 mL on the left. The structure marked **A** in the diagram represents this normal Type A tympanogram. Which of the following pathological conditions is MOST reliably ruled out by the presence of this Type A tympanogram pattern?
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