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A 70-year-old woman presents with a 3-cm lesion at the anal verge extending into the anal canal. Biopsies show a squamous cell carcinoma. Staging magnetic resonance imaging confirms a lesion 3.1 × 1.2 × 0.5 cm in size, possibly involving the internal sphincter muscle, without lymphadenopathy. What is the T stage in this patient?

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