<prompt> Which of the following is not an indication of radiotherapy in pleomophic adenoma of parotid:Involvement of deep lobe2nd histologically benign recurrenceMicroscopically positive marginsMalignant transformation  <response>: Radiotherapy is indicated for malignant recurrence, not for benign recurrence. Indications of Radiotherapy in Salivary Gland Tumor Low-grade neoplasm with close or positive margin Facial nerve involvement Multiple regional node metastasis High-grade histology Deep lobe involvement Perineural invasion Recurrence of malignant tumors. 