Cases reported "Parotid Neoplasms"

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1/941. Cerebral radionecrosis following the treatment of parotid tumours: a case report and review of the literature.

    radiotherapy is an accepted part of the treatment of malignant tumours of the parotid gland. The use of radiotherapy in benign parotid tumours, where spillage of tumour cells has occurred at operation, is more controversial. radiotherapy to the parotid bed is not without morbidity. Complications may arise as a result of radiation damage to neighbouring structures and there is also potential to induce malignant disease. A patient, whose postoperative radiotherapy following resection of a pleomorphic salivary gland adenoma was complicated by cerebral necrosis, is discussed. The literature pertaining to morbidity of radiotherapy for parotid tumours is reviewed.
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2/941. Cytogenetic study of a spindle-cell rhabdomyosarcoma of the parotid gland.

    The cytogenetic analysis of a spindle-cell rhabdomyosarcoma of the parotid gland in a 6-year-old boy is reported. The tumor cells showed an abnormal karyotype with a hypotriploid modal chromosome number and clonal structural rearrangements affecting chromosomes 1, 8, 12, 21, and 22. The tumor karyotype was: 59, XY, -1, -3, -4, -5, -6, 8, 8, del(8)(q22q24), -9, -10, del(12)(q13), -15, -16, -17, -18, der(21)t(12;21)(p11;p11), -22, der(22)t(1;22)(q12;p11).
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3/941. leiomyosarcoma of the parotid gland: a case report and review of the literature.

    BACKGROUND: A primary leiomyosarcoma of the parotid gland has been reported only three times in the English literature. This type of tumor represents an extremely rare group of salivary gland neoplasm. methods: A 44 year old man was initially seen with a 5 cm right parotid mass which was resected with a total parotidectomy, preserving the facial nerve. The patient had no palpable cervical lymph nodes. RESULTS: The majority of the specimen was made up of a relatively well demarcated tumor 5 cm in diameter. The tumor was noted to contain moderate to poorly differentiated primary leiomyosarcoma of the parotid. CONCLUSIONS: A primary leiomyosarcoma of the parotid gland is an extremely rare existing entity. A review of the literature reveals that primary leiomyosarcoma and other sarcomas of the major salivary glands may share similar histogenesis and biologic behavior with their soft tissue counterparts.
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4/941. Lymphoepithelial cyst with crystalloid formation. Cytologic features of two cases.

    BACKGROUND: The presence of amylase crystalloids (AC) in cystic lesions of the parotid gland is a rare occurrence and has been diagnosed to date as sialadenitis. We report the first two cases of parotid lymphoepithelial cyst (LC) containing this type of crystalloid. CASES: Case 1, a 56-year-old male, presented with a 3-cm parotid cyst. Fine needle aspiration (FNA) was performed on the mass. Smears showed numerous crystalloids identical to those described as crystallized amylase. Case 2, a 36-year-old female, had a 2-cm parotid mass. FNA smears exhibited the same features as did case 1. The two patients were treated with superficial parotidectomy, and an LC containing AC was diagnosed in both cases. CONCLUSION: When the above findings are present on FNA of parotid gland, the diagnosis of LC must be considered.
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5/941. The place of irradiation in the treatment of malignant tumors of the salivary glands.

    1. radiation therapy is not indicated after surgical removal with adequate margins of low-grade tumor. 2. radiation therapy is indicated with a) Inadequate surgical margins in low-grade tumors b) All high-grade tumors c) All recurrent malignant tumors 3. Irradiation of nerve pathways is indicated with demonstrated nerve and perineural invasion and/or with adenoicystic carcinoma. 4. Irradiation of the entire ipsilateral neck is indicated a) Wtih high-grade tumors unless radical neck dissection shows negative nodes b) In the place of radical neck dissection.
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6/941. High-grade carcinoma component in epithelial-myoepithelial carcinoma of salivary glands clinicopathological, immunohistochemical and flow-cytometric study of three cases.

    Three cases of epithelial-myoepithelial carcinoma (EMC) with coexisting areas of high grade carcinoma are reported. In two of the cases there was a previous recurrence, and in all three patients there had been a sudden increase in size before final surgery. The typical ductal and myoepithelial components of EMC showed the usual biphasic pattern and the expected immunophenotypes, with expression of wide spectrum cytokeratins, Cam 5.2 and EMA in the ductal part, and muscle-specific actin, smooth muscle actin, S-100 protein, vimentin and cytokeratins in the myoepithelial component. These areas also had a low mitotic count and low proliferation rate as measured by immunohistochemistry and by flow cytometry. Conversely, areas of high-grade tumour had the features of a large cell carcinoma, with focal mucin secretion in two cases. This high-grade component showed an epithelial immunophenotype in two cases, and was negative for all tested markers in the third one. The mitotic counts and the proliferation rates were much higher in these anaplastic areas. One of the patients died 3 months after treatment; another developed lymph node metastases 1 year later and was alive after 6 years of follow-up. The third patient was alive without evidence of disease 7 months after wide surgical resection of the tumour. The possibility of anaplastic transformation in EMC makes thorough sampling mandatory in this type of neoplasm.
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7/941. Unusual choristoma of the parotid gland in a girl. A possible trichoadenoma.

    An 8-year-old girl had a painless circumscribed nodule in the right parotid gland for 4 weeks. A tumour (1.3 cm diameter) within the salivary gland parenchyma showed small cystic spaces with horn-like material macroscopically. The tumour tissue contained solid squamous cell formations and cystic spaces limited by multilayered squamous epithelium and covered by layers of ortho- and parakeratotic cells. The cystic spaces contained keratotic lamellae. In some areas pin-like epithelial proliferations were seen. All epithelial cells were characterized by uniform nuclei, and no atypical mitoses were seen. Keratinizated masses with partial calcification were occasionally located in the interstitial tissue and replaced by multinucleated giant cells. The tumour was classified as a choristoma and resembled a trichoadenoma. The ectodermally derived oral and salivary gland epithelium may be the source of skin-like or adnexal tumours.
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8/941. Unilateral aneuploid dedifferentiated acinic cell carcinoma associated with bilateral-low grade diploid acinic cell carcinoma of the parotid gland.

    A dedifferentiated acinic cell carcinoma (AciCC) of the right parotid gland with lymph node metastases occurred in a 36-year-old woman. The tumour was associated with a bilateral well-differentiated AciCC. The two components of this tumour had different (high and low) proliferative activity measured by Mib-1 and different (aneuploid and diploid) dna content. Despite the presence of a high-grade component, TP53 mutations, microsatellite instability (MSI) and/or loss of heterozygosity (LOH) at the p53 locus were not detected. Although the follow-up of the patient is very short, the aggressiveness of the tumour is shown by a recurrence in the right parotid within 4 months and by the rapid development of regional metastases.
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9/941. Management of a large pleomorphic adenoma of the parotid gland.

    The surgical management of an extensive pleomorphic adenoma arising within deep lobe of the parotid gland is presented.
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10/941. Lipomatous pleomorphic adenoma of the parotid gland. classification of lipomatous tissue in salivary glands.

    Lipomatous pleomorphic adenoma is an unusual subtype with a lipomatous stromal component of more than 90% of the tumour tissue. This special type of pleomorphic adenoma must be distinguished from other types of lipomatous tumours or non-tumourous lipomatosis of the salivary glands. Until now only two cases of lipomatous pleomorphic adenoma have been reported in the literature. We report of a 36-year old woman who developed a well circumscribed nodule measuring 3.5 x 2.5 x 2 cm in the right parotid gland. The cut surface was grey-yellowish. Histologically, more than 90% of the tumour tissue was fatty tissue with univacuolar adipocytes. The pleomorphic epithelial elements were duct-like cells forming small lumina and spindle-shaped myoepithelial cell with surrounding mucoid stroma. Components of pleomorphic adenoma were intermingled with mature adipose tissue which was more concentrated in the central portion of the adenoma. Some compressed epithelial cords in the adipose tissue formed a septa-like pattern. The differential diagnosis to other lipomatous tumours (lipoadenoma, lipoma) and to non-tumourous interstitial lipomatosis as well as the possible pathogenesis as metaplastic change or epithelial-mesenchymal transdifferentiation are discussed.
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ranking = 5
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