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Posttreatment changes after surgery and radiation therapy.
A, Axial postcontrast T1WI shows a small ill-defined enhancing lesion at the site of the right parotid gland after surgical resection and irradiation. Recurrence could not be differentiated from posttreatment changes.
B, ADC map shows low signal intensity at the site of the lesion with a mean ADC value of 1.07 ± 0.18 × 10−3 mm2/s. Biopsy revealed only attenuated fibrous tissue with no tumor cells.
