Dermoid cyst of the parotid gland

Dermoid cysts of the head and neck are uncommon and account for only 7 % of all such cysts. They are most often reported to arise in the floor of the mouth and orbital and nasal regions; they are rarely seen in the parotid gland. To our knowledge, there have been only nine previous case reports in the literature. The authors report a case of a dermoid cyst with a left parotid location and discuss its nature, diagnosis, and treatment. The previous reports are reviewed and commented upon.     

Lymphoepithelial cyst of the parotid gland

A case of a lymphoepithelial cyst presenting as a parotid tumour is described. Aspects of diagnosis and management are discussed, as well as current theories on the origin and development of lymphoepithelial (branchial) cysts.     

Dermoid cyst of the parotid gland

A dermoid cyst occurring within the parotid gland of a 37-year-old Chinese man is reported. The diagnostic difficulties, histopathological features and pathogenesis are considered.     

Hydatid cyst in the duct of the submandibular gland

The case of a hydatid cyst located in the duct of Wharton of a 56-year-old farmer is reported not only because of the unusual location of the disease, but also because the clinical manifestations and surgical findings of the hydatid cyst strongly resembled those of a salivary calculus in the duct of Wharton. The patient presented with a non-painful swelling of the right submandibular region. The mass, which appeared 5 years before seeking medical advice, augmented progressively during the first year after its onset and remained stable during the next 4 years. The subsequent surgical excision of the mass was uneventful and a round mass, which was palpated intraoperatively in the duct of Wharton was assumed to be a sialolith. The diagnosis for a hydatid cyst of the duct of Wharton was made by histological examination. Although salivary calculus is the most common finding in cases of obliteration of the duct of Wharton, histological examination of the surgically excised submandibular gland may reveal benign tumours. In extremely rare cases where hydatid cysts are located in the cervicofacial area, a detailed further diagnostic procedure is required in order to diagnose possible involvement of other organs.     

腮腺上皮样血管内皮瘤误诊为腮腺囊肿伴出血1例

回顾1例被误诊为腮腺囊肿伴出血的上皮样血管内皮瘤的患者的病历资料,结合文献讨论该疾病的临床特点、诊断、治疗。     

Unusual MRI appearance of a lymphoepithelial cyst in the parotid gland

Lymphoepithelial cysts, which are also known as branchial cleft cysts, commonly occur in the lateral cervical region. Lymphoepithelial cysts arising in the parotid gland are rare and must be distinguished from parotid gland tumors. Magnetic resonance imaging (MRI) is useful for diagnosing parotid gland lesions, and MR images of lymphoepithelial cysts typically display a cystic mass that appears homogeneously hypointense on T1-weighted images and homogeneously hyperintense on T2-weighted images. However, some parotid gland tumors that retain fluid in their inner sections show similar MRI findings to lymphoepithelial cysts. Furthermore, lymphoepithelial cysts are sometimes modified by inflammation, and these cases are hard to diagnose. We report the case of a 59-year-old female with a lymphoepithelial cyst that arose in the parotid gland. The cyst had been affected by inflammation and displayed atypical imaging findings, i.e., heterogeneous signal intensity of the liquid component and the presence of a well-enhanced capsule-like structure surrounding the liquid component. In addition, we compare the MRI findings of this case with those of two other cervical lymphoepithelial cysts.     

Adenoid cystic carcinoma associated with mucous retention cyst of the parotid gland

Mucous retention cysts of the parotid gland are rare, and a coexistent adenoid cystic carcinoma is even an unusual occurrence. Such coexistent adenoid cystic carcinomas with mucous retention cyst of the parotid gland are difficult to diagnose clinically and, at times, stage difficulty in their management. We report a rare case of adenoid cystic carcinoma associated with mucous retention cyst of the parotid gland with its diagnostic and management dilemma in a 14-year-old adolescent girl.     

A ciliated cyst as a component of pleomorphic adenoma of the parotid gland

A large cyst, lined with ciliated cells (ciliated cyst), was found as a component of a pleomorphic adenoma of the left parotid gland in a 34-year-old Japanese man. The dimensions of the tumor were 25 × 33 mm and it consisted of a solid mass with a centrally located cyst 20 × 23 mm. which contained yellowish-brown material of muddy consistency. The tumor was encapsulated and the solid mass had features typical of a pleomorphic adenoma. The inner surface of the cyst was lined with ciliated cells and scattered mucus-secreting cells in addition to cuboidal-to-flattened cells. In some regions, the neoplastic cells of the pleomorphic adenoma were exposed to the cavity of the cyst. A histological transformation from ciliated cells to pleomorphic adenomatous cells was also observed. These findings indicated that the ciliated epithelium was an element of the tumor. This is the first report, to our knowledge, of a ciliated cyst derived from some elements of a pleomorphic adenoma of the salivary gland.     

Hydatid cyst in the maxillofacial region

Two cases of hydatid cyst, one in the mandibular body and the other in the infratemporal fossa, are reported. Treatment by excision was successful in both patients.     

Lipoma of the parotid gland

This case report describes a lipoma that appeared as a parotid gland tumor. The lipoma is an asymptomatic, slow-growing, nontender mass. This lesion is rare at this site and exhibits no unique clinical features. There is no reliable method of establishing a preoperative diagnosis; therefore, the lesion should be included as a rare possibility in the differential diagnosis of tumors involving the parotid gland. The treatment of choice is surgical excision, and recurrence is rare.     

Actinomycosis of the parotid gland

Primary parotid actinomycosis is extremely rare. Two patients are discussed in whom this disease presented quite differently. The literature is reviewed and the management described, with particular reference to antibiotic therapy.