Solitary fibrous tumor of the lower lip involving minor salivary gland components: Report of a case and review of the literature of salivary gland cases

SummaryA case of solitary fibrous tumor of the lip is described. A 65-year-old Japanese woman had a painless mass in her lower lip that gradually increased in size and finally ulcerated. Computed tomography revealed a well-demarcated submucosal mass. On the cut surface, the tumor was well-circumscribed, solid, and yellowish-white with small cystic spaces. Histopathologically, it was encapsulated and consisted of an interlacing proliferation of spindle-shaped cells immunopositive for CD34, vimentin, Bcl-2, and CD99, with scattered salivary glandular structures with irregular cellular arrangements. This is the first case report of solitary fibrous tumor of the lip with reactive hyperplasia of minor salivary gland components based on our review of the literature