[Rare tumors of the parotid gland. Lymphadenoma of a sebaceous gland and extracranial metastasis from glioblastoma].

Tumors of the parotid gland can be benign or malignant lesions.The pathophysiology of rare tumors of the parotid gland is often not sufficiently explored in this paper two rare histological entities are described. In one patient a benign sebaceous lymph-adenoma was histologically diagnosed. This type of tumor accounts for only 0.196 of all adenomas. The international literature is not conclusive about whether the tumor originates in the parotid gland itself or in the parotid lymph nodes. The second patient presented with a metastasis from a glioblastoma in the parotid gland. Again, the mechanism for metastasis of an intra-cerebral tumor to the parotid gland remains unknown. Iatrogenic seeding during a neurosurgical intervention is a probable explanation. The actual clinical course of his patient and the cases described in literature render surgical removal of such a metastasis questionable.