Metastasizing pleomorphic adenoma of the parotid gland: A common tumour with a very unusual presentation

Metastasizing pleomorphic adenoma is recognized as a subtype of pleomorphic adenoma in WHO classification 5th edition of salivary glands. The controversy pertaining to the entity is the benign features of the disease even at a metastatic site. We present a rare case of left recurrent pre-auricular swelling in a young male reported as metastasizing pleomorphic adenoma. A nineteen-year-old male presented with left preauricular swelling seven years ago which was diagnosed as pleomorphic adenoma and underwent complete excision of tumour. The tumour recurred twice - two and five years after the surgery. At the second recurrence, the level II neck dissection showed multiple encapsulated deposits of pleomorphic adenoma having similar morphology in the cervical soft tissue with no features of high-grade transformation.

Metastasizing Pleomorphic Adenoma of Parotid Gland: A Case Report and Literature Review

The authors hereby present a case report of metastasizing pleomorphic adenoma (MPA) of the parotid gland with multiple metachronous cervical lymph node metastases and sternocleidomastoid muscle infiltration. Diagnostic evaluation, surgical management, and follow-up are discussed along with a brief review of the literature.

Metastasizing Pleomorphic Adenoma Case Report and Review of the Literature

Pleomorphic adenoma (PA) is by far the most common salivary gland tumor. It is well known that PA can undergo malignant transformation. However, in rare occasions it can metastasize preserving its benign phenotype. Metastasizing pleomorphic adenoma (MPA) constitutes an extremely rare tumor. Here we are reporting an unusual MPA affecting the mandible that was preceded by a submandibular gland pleomorphic adenoma.