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(A) Intraoperative ultrasound still from patient No. 2 demonstrating the tongue base squamous cell carcinoma, with an echogenic line (white arrow) indicating the interface between tumor and adjacent normal tissue. Tumor thickness was measured to be 1.36 cm. (B) After removal from the patient, the tumor specimen was sectioned and measured. The tumor margin is marked with a black arrowhead; the overall tumor thickness was found to be approximately 1.3 to 1.4 cm.
