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A. Contrast-enhanced axial computed tomography shows a 3.7-cm cystic mass (arrows) in the right pyriform muscle. The lesion has thick septa and a wall, suggesting a malignant tumour. B. Transvaginal ultrasonography shows the cystic lesion (arrows), which was sampled with an 18-gauge biopsy needle (open arrows). The histologic diagnosis was squamous cell carcinoma.
