MEMBRANOUS BASAL-CELL ADENOMA OF THE SALIVARY-GLAND - A CLINICOPATHOLOGICAL STUDY OF 12 CASES

Twelve cases with membranous basal cell adenoma of the salivary gland were analysed clinicopathologically. Its histology was characterized b y palisading of peripheral cells and an excessive hyaline basal membra ne. The differential diagnosis involved the solid variant of basal cel l adenoma, basal cell adenocarcinoma, solid subtype of adenoid cystic carcinoma and basaloid squamous cell carcinoma. Four cases had coexist ing dermal cylindromas of the scalp. Screening for skin lesions of the scalp or other locations is suggested. In 8 cases, the tumors demonst rated multifocal origin. Total parotidectomy rather than superficial p arotidectomy is suggested to avoid the recurrence of the tumor. One ca se showed malignant transformation and cervical lymph node metastases. A close follow-up after treatment is necessary.