What is parotid oncocytoma?

Oncocytoma, also known as oxyphilic adenoma or mitochondrioma of the parotid gland is a rare benign tumor constituting less than 1.5% of all parotid lesions. As there are no characteristic imaging findings, this lesion often poses a diagnostic and clinical challenge.

What does parotid ultrasound show?

Parotid gland masses include benign tumours, malignant tumours and chronic inflammatory diseases. Identification of benign or malignant lesions is linked with management. Ultrasound plays an important role in the diagnosis of space-occupying lesions.

Where is oncocytoma found?

Renal oncocytoma is a noncancerous (benign) growth in one or both of your kidneys. These lesions may not cause symptoms or need treatment. Healthcare providers often discover renal oncocytomas accidentally while performing diagnostic tests for another issue.

How do you scan a parotid gland ultrasound?

SCANNING TECHNIQUE

1. Tip the patient’s head back for better access.
2. Assess the gland’s echogenicity.
3. Due to it’s fat content, the parotid will be more attenuative than the submandibular gland.
4. Compare both sides if necessary.
5. Scan the entirety of the gland from midline to lateral several times to assess :

Is an oncocytoma malignant?

An oncocytoma is a tumor made up of oncocytes, epithelial cells characterized by an excessive amount of mitochondria, resulting in an abundant acidophilic, granular cytoplasm. The cells and the tumor that they compose are often benign but sometimes may be premalignant or malignant.

What is a parotid cyst?

A parotid cyst is a painless swelling or mass Forms in the major salivary glands, also known as the parotid glands. Although the specific cause of this condition is unknown, parotid cysts commonly occur in patients with HIV.

What causes benign parotid tumor?

Causes of Salivary Gland Tumors The cause of most salivary gland tumors is currently unknown, but genetic research is being conducted to uncover it. In some cases, skin cancer can spread to the parotid gland. Smoking is also known to cause one type of benign tumor, Warthin’s.

Is oncocytoma benign or malignant?

Oncocytoma is a benign solid renal tumor. Unfortunately, it is usually difficult to distinguish an oncocytoma from an RCC on imaging, thus tissue sampling is usually required to make the diagnosis.

How is oncocytoma treated?

Renal oncocytomas can be treated conservatively with partial nephrectomy if possible based upon size. [9] If not possible, oncocytomas can be treated with a total nephrectomy.

What goes through the parotid gland?

The facial nerve and its branches pass through the parotid gland, as does the external carotid artery and retromandibular vein. The external carotid artery forms its two terminal branches within the parotid gland: maxillary and superficial temporal artery. The gland usually contains several intraparotid lymph nodes.

What are the radiographic features of parotid gland oncocytomas?

Parotid gland oncocytomas can uncommonly (<10%) be multifocal or bilateral 3. Radiographic features Ultrasound Sonographic features are non-specific and include 3: ovoid mass usually homogeneously hypoechoic but can be heterogeneous

What is oncocytoma of the salivary glands?

Oncocytoma of the salivary glands | Radiology Reference Article | Radiopaedia.org Oncocytomas of the salivary glands are rare benign epithelial tumors making up <1% of all salivary gland tumors. Epidemiology They typically present in older individuals (6th to 8th decades of life).

What is oncocytoma and how common is it?

Oncocytoma are rare tumors. They are predominantly tumors that occur in those who are middle aged and above. Women, usually in the seventh or eighth decade, are likely to be affected. The parotid gland is the most frequent site (80%) for all salivary gland tumours. These tumors are slow growing and may rarely be bilateral.[2]

What are oncocytes?

Oncocytes are epithelial cells which appear as cells with abundant granular, eosinophilic cytoplasm, a centrally pyknotic nucleus, and ultrastructurally are crammed with numerous mitochondria of various sizes.