disease. Chemotherapy is considered on a case-by-case basis, as data on the positive effects of chemotherapy are limited. Clinical studies are ongoing, however. Images See also Primary cutaneous adenoid cystic carcinoma Collagenous spherulosis References Further reading Neville, Damm, Allen, Bouquot. Oral and Maxillofacial Pathology. 2nd edition. External links Search for clinical trials at ClinicalTrials.gov Search for research literature at PubMed.gov Search for consumer health information at Medlineplus.gov Salivary gland neoplasia Rare cancers