[Polymorphous low-grade adenocarcinoma of the palate with cervical lymph node and distant metastasis: report of one case and review of the literature].

Polymorphous low-grade adenocarcinoma is a rare salivary gland tumor with lower rate of local and regional metastasis and rare distant metastasis. The prognosis is relatively good. This paper reported a case of palatal polymorphous low-grade adenocarcinoma with cervical lymph node and distant metastasis, and discussed clinical characteristics, differential diagnosis, treatment, prognosis based on literature review.