Oncocytic lipoadenoma: a rare case of parotid gland tumor and review of the literature

Oncocytic sialolipoma of parotid gland: Case report and literature review

Neoplastic lipomatous lesions of the salivary glands constitute ≤0.5% of all the salivary gland tumors. Oncocytic sialolipoma of the parotid glands is extremely uncommon. We report a case of oncocytic sialolipoma of the parotid gland in a 59-year-old male who presented with a gradually increasing swelling of the right parotid. Excisional parotid biopsy performed in view of possible pleomorphic adenoma as suggested on ultrasonography showed histological features consistent with oncocytic sialolipoma. We also described the characteristics of 24 previously reported cases of oncocytic sialolipoma of the parotid gland. The median age of the patients including the present case was 56 years (range 7-89), and 14 were male. The largest and the least reported sizes of the tumor were 7.0 and 1.4 cm, respectively. The left-sided parotid gland was more commonly involved (14/23). Despite its rarity, oncocytic sialolipoma should be considered in lipomatous parotid lesions showing epithelial components with oncocytic changes.

Complex Component of Oncocytic and Non-Oncocytic Lipoadenomas in the Parotid Gland: A Case Report

Oncocytic lipoadenoma of the salivary gland is a rare tumor that develops mainly in the parotid gland. We report a case of oncocytic lipoadenoma of the parotid gland in a 70-year-old woman. The tumor measured 30 × 20 mm and had a well-circumscribed tan-brown surface. The tumor was histologically composed of oncocytic and lipomatous lesions without atypia. In addition to the oncocytic lipoadenoma, a small lipomatous tumor, measuring 10 × 7 mm, was found in the resected parotid gland. Macroscopically, this tumor was yellow and indistinguishable from the parotid gland. Microscopically, the tumor was rich in fats and contained an area of conglomerated duct-like proliferation and salivary gland components. Therefore, the tumor was diagnosed as a non-oncocytic lipoadenoma with a sialoadenoma component. We report the first case of double component oncocytic and non-oncocytic lipoadenomas of the salivary gland.

An extremely rare case of giant oncocytic adenolipoma of the parotid gland

Oncocytic adenolipoma is a rare tumor to occur in the salivary gland, which can present as a giant neck mass. Until now, <20 such cases are reported. We report this rare case for surgeons to consider it as one of the differential diagnoses.

A case of oncocytic lipoadenoma of the submandibular gland and its diagnostic cytology challenges

Lipomatous tumors of the salivary gland in general are rare and oncocytic lipoadenomas are even much rarer. Most of the reported cases of oncocytic lipoadenoma were located in the parotid gland and to the best of our knowledge, only four cases reported to arise from the submandibular gland. The preoperative interpretation of the aspirates taken from these lesions can be difficult and challenging. We report a case of a 41 year old gentleman who presented with submandibular gland swelling. CT scan of the neck revealed an oval-shape enhancing mass in the inferior aspect of the right submandibular gland measuring 19 × 12 mm. Fine needle aspiration biopsy (FNAB) showed hypocellular smears with few clusters of epithelial cells having oncocytic appearance. The cytologic findings were interpreted as "oncocytic lesion." Submandibular gland excision was done. Histologically, a final diagnosis of oncocytic lipoadenoma was rendered. We present this rare entity to add to the few cases reported to date and to upsurge awareness during cytologic examination of oncocytic salivary gland lesions.

A rare cause of primary hyperparathyroidism: Parathyroid lipoadenoma

OBJECTIVE

The main cause of primary hyperparathyroidism is a single parathyroid adenoma. Parathyroid lipoadenomas contain abundance of fat cells. Because of these histological features, they can mimic normal parathyroid tissue at the histopathologic examination and radiological imaging could be difficult to localize lipoadenomas.

CLINICAL PRESENTATION

In this case report, we present three cases of functional parathyroid lipoadenomas.

CONCLUSION

Preoperative imaging modalities often can't localize lipoadenoma. In our cases, SPECT has seen more successful than ultrasonography or CT. There may not be gender predominance at parathyroid lipoadenomas. Intraoperative pathology consultation and rapid biochemical workup can help the surgeon in difficult cases.

Lipoadenoma of the adrenal gland: report of a rare entity and review of literature

Adrenal lipoadenoma is an extremely rare tumor. Only four cases have been reported so far. The authors reported a case of adrenal lipoadenoma in a 46-year-old man with the history of abdominal pain. The present case, manifesting as a nonfunctional adrenal tumor, is characteristically comprised of a mixture of mature adipocytes and adrenocortical cells. We also reviewed this tumor in different organs which have been published in the literature.