[Stem text was not captured in the OCR; the following is a faithful paraphrase reconstructed from the explanation.] A patient with recent extended travel (prolonged immobilization) presents with acute-onset dyspnea and tachypnea, a normal lung examination, and sinus tachycardia on ECG. Pulmonary embolism is suspected. Because CT angiography requires intravenous contrast that must be avoided in this patient (chronic kidney disease, risk of contrast-induced nephropathy), a ventilation/perfusion (V/Q) scan is performed. Which of the following V/Q scan patterns is the most definitive diagnostic finding for pulmonary embolism?
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