Pleomorphic adenoma with extensive squamous metaplasia and keratin cyst formations in minor salivary gland: a case report

Pleomorphic adenoma (PA), the most common salivary gland tumor, accounts for 54 to 65% of all salivary gland neoplasias and 80% of the benign salivary gland tumors. It most frequently affects the parotid gland, followed by the submandibular and the minor salivary glands. Microscopically, mucous, sebaceous, oncocytic and squamous metaplasia, sometimes with the formation of keratin pearls, may be present, but the latter rarely results in the formation of extensive keratin-flled cysts lined by squamous epithelium. Extensive squamous metaplasia can be mistaken for malignancy, including mucoepidermoid carcinoma and squamous cell carcinoma. Here, we present an unusual case of PA with extensive squamous metaplasia and keratin cyst formations in a minor salivary gland, and discuss its microscopic features, including the immunohistochemical characteristics, and differential diagnosis of this uncommon presentation

What has been the impact of petroleum resources in Oman, UAE and Yemen? : a blessing or a curse?

EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Mucinosis and Disorders of Collagen and Elastic Fibers

Cutaneous mucinoses are a heterogeneous group of disorders having as a common denominator the deposition of an excess of mucin (acid glycosaminoglycans, mostly hyaluronic acid) in the dermis or in the hair follicles. They are divided into primary and secondary forms. Primary cutaneous mucinoses are characterized by specific clinical lesions in which mucin deposition is the distinctive histological sign, while in secondary mucinoses, mucin deposition is simply an accessory histological sign. Disorders of collagen and elastic fibers are divided into hereditary and acquired forms. Both forms can be further divided into those diseases characterized by an increase and those by a decrease in collagen and elastic tissue. A peculiar variant of disorders of dermal connective tissue includes the primary perforating dermatoses