What does a pleomorphic adenoma look like?
CT examination a pleomorphic adenoma usually appears as smoothly marginated or lobulated homogeneous soft tissue density globular mass. Necrosis can be seen in larger masses. Few foci of calcification are common.
Can ultrasound detect parotid tumor?
The sensitivity, specificity, positive predictive value, negative predictive value and accuracy of ultrasound for the diagnosis of parotid gland masses were 38.9%, 90.1%, 29.2%, 93.3% and 85.2%, respectively, and accuracy for malignant masses was 20%.
How can you differentiate warthin’s tumor and pleomorphic adenoma?
Conclusion: Ultrasound imaging characteristics, including multiple occurrences, shape, intrinsic cystic change, and the grade and distribution of tumor vessels, can be used to differentiate pleomorphic adenomas from Warthin’s tumors.
Is pleomorphic adenoma movable?
Grossly, the tumor is freely movable, solid, sometimes lobulated and occasion- ally cystic. If recurrent, multinodular masses are common. Histologically, within a fibrous capsule, the pleomorphic adenoma is composed of an extremely variable mixture of epithelial and myoepithelial elements.
Is pleomorphic adenoma encapsulated?
The tumor is not enveloped, but it is surrounded by a fibrous pseudocapsule of varying thickness. The tumor extends through normal glandular parenchyma in the form of finger-like pseudopodia, but this is not a sign of malignant transformation.
What does a parotid ultrasound show?
Ultrasound is the initial imaging method for salivary gland swellings. The deep lobe of the parotid is difficult to be examined using ultrasound (U/S). U/S has higher accuracy in delineating benign and malignant salivary gland tumors . In acute inflammation, we use ultrasound to look for sialolithiasis or abscesses.
What applications does ultrasound have in investigating salivary gland masses?
Ultrasound provides an immediate diagnosis in acute or chronic inflammatory salivary diseases and can visualize sialolithiasis as small as 0.4 mm. Ultrasound is also an important imaging modality for salivary gland tumors, guiding fine needle aspiration (FNA) for cytological diagnosis.
What is the most common benign tumor seen in parotid gland?
Pleomorphic adenoma (PA) is the most common benign tumor of major or minor salivary glands.
Is pleomorphic adenoma unilateral or bilateral?
Although pleomorphic adenomas are usually described as a single unilateral mass in the parotid gland, bilateral involvement has been described in about 35 cases , .
How big are parotid tumors?
The parotid gland (PG) is the most common site involved in 85% of cases. PG tumors’ size varies from a few millimeters to several centimeters and is about 2-6 cm on average. However, because of insidious growth and asymptomatic nature, untreated tumors of the PG can attain large size.
What is pleomorphic adenoma?
Pleomorphic adenoma most commonly occurs in salivary glands(especially parotid gland) but can arise in any tissue that has glandular myoepithelial tissue. Other reported sites include lacrimal glands, external auditory canal, skin, breast, and vulva 1. Microscopic appearance
How common is pleomorphic adenoma of the salivary glands?
Sonographic Imaging of a Pleomorphic Adenoma of the Salivary Gland Tumors of the salivary glands, although not rare, are uncommon. They represent less than 5%
What are the histologic features of pleomorphic tumors?
Microscopic appearance These tumors characteristically have a mix of epithelial and mesenchymal tissues 1,2. There is a spectrum of histological appearances (thus the term pleomorphic) but commonly includes ductal epithelium, myoepithelial cells, and myxoid stroma.
How is pleomorphic adenoma of the parotid gland treated?
Presently pleomorphic adenoma of the parotid gland is treated either with superficial (Patey’s operation) or total parotidectomy with the latter being the more frequently performed procedure due to lower incidence of recurrence. Meticulous technique is required to preserve the facial nerve.