Figure 11a. Parotid gland carcinoma after acute lymphoblastic leukemia in a 14-year-old boy. The patient had been treated for acute lymphoblastic leukemia with chemotherapy and radiation therapy at the age of 5 years. Axial T1-weighted (a) and fat-saturated T2-weighted (b) MR images demonstrate a left parotid gland mass (arrows in a). The lesion is well defined and hypointense in a, with conspicuously higher homogeneous signal intensity in b. Surgical resection and posterior histologic examination demonstrated a low-grade mucoepidermoid carcinoma. Follow-up MR imaging showed no tumor recurrence.