Monday, June 10, 2013

HEAD NECK 17 Parotid tumors

8.5 TUMOURS

8.5.1 MIXED TUMORS

A  common  lesion  of the salivary gland  is  the  mixed  tumours
(pleomorphic adenoma).

*  Eighty  percent of all benign tumours probably originate  from
   the myoepeithelial cells of the ducts.

*  Microscopic examination shows a network of strands of  spindle
   shaped and stellete cells.

*  In  one-third  of  cases loose  myxoid  pattern  predominates. 
   Half, in addition, have pseudocartilaginous structures.

Treatment  is  superficial  Parotidectomy  with  conservation  of
branches of the facial nerve.

8.5.2 PAILLARY CYSTADENOMA LYMPHOMATOSUM (WHARTHIN'S TUMOUR)

The lesion feels firm on examination and represent parotid tissue
sequestered in a lymphnodes.  It is the second most common benign
tumour of salivary tisse

The Histogenesis is unceertain


Treatment is surgical excision.

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