Parotid Space Flashcards
1
Q
Acute Parotitis
A
- Stone obstruction, Viral (75% bilateral), Bacterial (usually unilateral, adjacent stranding), Autoimmune.
- Diffuse enlargement and enhancement. Increased density on CT
- May see associated cellulitis or myositis. May develop abscess with bacterial
2
Q
Sjogren Syndrome of Parotid
A
- Early: Innumerable T2 hyperintense cysts in acute phase represents lymphocyte-plasma cell infiltration that obstructs intercalated ducts with enlarged tiny distal ducts throughout the gland
- Late: Lymphocytes destroy tissue, leaving larger T2 hyperintense cysts in both parotid glands which are cystic dilation of intraglandular ducts (indistinguishable from BLELs of HIV), and more solid lymphoid aggregates.
- CT: Early, normal or dense and enlarged. Late: calcifications, multilobular configuration, fatty involution
- If dominant solid mass, consider biopsy
3
Q
Benign Lymphoepithelial Lesions (BLELs) of HIV
A
- 3-tiered classification (can be mix of these) (LELs = germinal centers and multinucleated giant cells)
- (Solid) Persistent generalized parotid LAD (only follicles)
- (Mixed cystic and solid) Benign lymphoepithelial lesions (nodular follicles line cyst wall)
- (Cystic) Benign lymphoepithelial cysts (mostly fluid) - Will also see cervical LAD, tonsillar hypertrophy (lymphofollicular hyperplasia)
4
Q
Sialadenitis of Parotid
A
1.
5
Q
Benign Mixed Tumor of Parotid
A
1.
6
Q
Warthin Tumor of Parotid
A
1.
7
Q
Schwannoma of Parotid
A
1.
8
Q
Mucoepidermoid Carcinoma (MECa) of Parotid
A
1.
9
Q
Adenoid Cystic Carcinoma (ACCa) of Parotid
A
1.
10
Q
Acinic Cell Carcinoma of Parotid
A
1.
11
Q
Malignant Mixed Tumor of Parotid
A
1.
12
Q
Non-Hodgkin Lymphoma (NHL) of Parotid
A
1.
13
Q
Metastatic Lymphadenopathy of Parotid
A
1.
