<prompt> The salivary gland neoplasm which characteristically spreads perineurally along the caranial nerves isPleomorphic adenomaAcinic cell carcinomaMucoepidermoid carcinomaAdenoid cystic carcinoma  <response>: .ADENOID CYSTIC CARCINOMA 10 of salivary tumours It is common in submandibular and minor salivary glands. It consists of myoepithelial cells and duct epithelial cells with cribriform or lace like appearance. It involves facial nerve very early, spreads through the perineural sheath and infiltrates into the perineural tissues over a long distance, more proximally. It also invades periosteum and bone medulla early and spreads extensively. Prognosis is poor. Radical parotidectomy and radical radiotherapy is the treatment of choice. ref:SRB;s manual of surgery,ed 3,pg no 369 