Learning Objectives
Review malignant and benign adult parotid tumours correlating with histologic pathology.
Background
Salivary gland neoplasms
Incidence 0.4-2.5 in 100,000 [1]
Majority (80%) are parotid gland tumours
Account for approximately 3% of head and neck tumours [2]
Parotid gland tumours [3]
Routes of spread
Incidence of distant metastases from parotid primary malignant tumor varies from 20-40% [4]
Sites include lung,
long bones,
brain and liver
Pleomorphic adenoma rarely spreads,
but there are 42 reports in literature of metastasising pleomorphic adenoma [5]
SCC and malenoma from the cheek and temple region can metastasise to intraparotid lymph nodes [6,
7]...
Imaging Findings OR Procedure Details
PRIMARY BENIGN EPITHELIAL
Pleomorphic adenoma is the commonest parotid tumor by far
These ‘benign’ tumors of the parotid can harbor or become malignant,
(with the exception of WT) and are surgically removed
Imaging features of pleomorphic adenoma and Warthin tumor are better documented in the literature
The other tumors have variable imaging features
Pleomorphic Adenoma (PA)
Also known as benign mixed tumor
Most common benign tumor in adults 45-80%
Middle aged females
Palpable slow growing mass
Superficial 90% > deep lobe 10%
Can grow to...
Conclusion
Conclusion
The main role of imaging in parotid tumor
Determine if the lesion has aggressive features
Extent of tumor involvement
Metastatic disease from and to parotid
Type and extent of surgery is determined by imaging
Although only tissue sampling can give histological certainty of tumor nature,
imaging plays an important role in the diagnosis and treatment of parotid tumors.
Personal Information
L.
L.
Wang,
Neuroradiology Fellow,
University of Cincinnati Hospital Medical Center
D.
Wang,
Radiology Registrar,
Royal Melbourne Hospital
I.
Bhutani,
Pathology Resident,
University of Cincinnati Hospital Medical Center
R.
Cornelius Neuroradiologist,
University of Cincinnati Hospital Medical Center
References
1. Spiro,
R.H.,
Salivary neoplasms: overview of a 35-year experience with 2,807 patients. Head Neck Surg,
1986.
8(3): p.
177-84.
2. Jin,
G.Q.,
et al.,
Distinguishing benign from malignant parotid gland tumours: low-dose multi-phasic CT protocol with 5-minute delay. Eur Radiol,
2011.
21(8): p.
1692-8.
3. Barnes,
L.,
et al.,
Pathology and Genetics of Head and Neck Tumours,
in World Health Organization Classification of Tumours2005,
IARC Press: Lyon.
4. Schwentner,
I.,
et al.,
Distant metastasis of parotid gland tumors. Acta Otolaryngol,
2006.
126(4): p.
340-5....