Invasive micropapillary salivary duct carcinoma mixed with mucin-rich salivary duct carcinoma in minor salivary gland: a rare case report.

Background: Invasive micropapillary salivary duct carcinoma (SDC) is a rare variant of SDC. Although several cases involving major salivary glands have been reported, no cases arising de novo in minor salivary glands have been reported to date. Here we report the first case of invasive micropapillary SDC that arose in a minor salivary gland of the parapharyngeal space.