Comparative clinicopathological study of intraoral sebaceous hyperplasia and sebaceous adenoma

A Guide to Yellow Oral Mucosal Entities: Etiology and Pathology

When faced with an uncertain clinical pathosis in the oral cavity, identifying the color of the mucosal lesion helps to narrow down a differential diagnosis. Although less common than red and white lesions, yellow lesions encompass a small group of distinct mucosal pathologic entities. Adipose tissue, lymphoid tissue, and sebaceous glands are naturally occurring yellow constituents of the oral cavity and become apparent with associated developmental or neoplastic lesions. Reactive and inflammatory lesions can create a yellow hue due to purulence, necrosis, and calcification. Some systemic diseases are known to deposit yellow bi-products such as amyloid or bilirubin into the oral mucosa of an affected person, and while not always yellow, unusual entities like verruciform xanthoma and granular cell tumor fall under the umbrella of yellow lesions given their occasional propensity to demonstration the color. This chapter aims to explore the unique group that is yellow lesions presenting in the oral mucosa.

Intra-oral Sebaceous Gland Tumours in Two Dogs

A 12-year-old female miniature schnauzer and a 12-year-old neutered female cocker spaniel each had a grey-yellow nodular lesion arising from the gingiva. Microscopical examination showed that both nodules were composed of varied proportions of sebocytes and basal-type reserve cells with few ducts lined by stratified squamous epithelium. Based on the histopathological findings, the cases were diagnosed as sebaceous adenoma and sebaceous epithelioma, respectively. In man, the occurrence of sebaceous neoplasms in the oral cavity has been reported to some extent, but these lesions are very rare in animals. To the best of our knowledge, this is the first report of intra-oral sebaceous neoplasms in dogs. Intra-oral sebaceous epithelioma has never been reported in animals.

Clear cell change in a lower lip mucocele

Oral mucocele is a common reactive lesion of the oral mucosa, which microscopically exhibits mucus extravasation surrounded by a wall of granulation tissue containing abundant foamy macrophages. Unusual variants, such as superficial mucoceles, mucoceles with myxoglobulosis-like change and mucoceles with synovial metaplasia-like change have been reported. We report a 74-year-old man who presented an asymptomatic translucent swelling on the lower labial mucosa diagnosed as mucocele showing a macrophage proliferation with extensive clear cytoplasmic vacuolation and signet-ring formation. This unusual presentation expands the microscopic spectrum of the oral mucoceles and can eventually lead to differential diagnosis with primary or metastatic clear cell neoplasms. In these cases, relevant clinical information, histochemistry and especially immunohistochemistry, are helpful for arriving at an accurate diagnosis.

A rare case of sebaceous adenoma of the palate, with literature review

Objective:

We present the first reported case of sebaceous adenoma of the palate, to our knowledge.

Method:

Case report and review of the English language literature, with a focus on the pathological spectrum of sebaceous glands.

Case report:

A woman presented with a growth on the hard palate, which was excised and examined. Histopathological analysis showed features of sebaceous adenoma. Further evaluation with Sudan Black B special stains and Ki 67 immunohistochemistry was performed.

Conclusion:

Sebaceous adenomas in the oral cavity are very rare, with only 10 cases previously reported in the English language literature. Sebaceous adenoma of the palate has not previously been reported, to our knowledge. We discuss the role of special stains and immunohistochemistry in the diagnosis of this tumour.