HEAD NECK 18 malignant parotid

8.6.1 MALIGNANT MIXED TUMOURS

Malignant mixed tumours arise from a neoplastic transformation of

a  benign mixed tumour.  Patients are generally older,  malignant

lesions  are  usually  larger and any mixed  tumour  may  contain

within  it malignant elements and may result in  adeno-carcinomas,

squamous cell carcinoma or malignant spindle cell alternation.

With  the exception of mixed tumours; benign lesions of  salivary

tissues have no malignant potential.

CLINICAL PRESENTATION

Mixed  tumour may grow for years at a slow pace.   The  malignant

component  suddenly develops and there is a marked change in  its

course.

Fixation  of  glands to skin or underlying  structures,  palpable

nodes and involvement of the VIIth nerve are all diagnostic.

Excision of the mass and histologic examination are indicated  in

every case.

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