1/385. Treatment of complicated cutaneous malignant neoplasms by modern radiotherapy: principles, practice, and results.The indispensability of modern radiotherapy for certain complicated cases of cutaneous malignant neoplasms is demonstrated by a review of its principles and demonstration of results achieved by its practice in five representative cases.- - - - - - - - - - ranking = 1keywords = neoplasm (Clic here for more details about this article) |
2/385. Unusual presentation of a salivary pleomorphic adenoma: a case report and review of the literature.Although pleomorphic adenomas are the most common neoplasms of salivary gland origin, our knowledge of the etiology, growth, and recurrence patterns, and significance of the varying histologic features of these tumors, remains limited. We present the case of a 66-year-old man with an unusual presentation of a pleomorphic adenoma, and review the important clinical and pathologic features of this entity.- - - - - - - - - - ranking = 0.2keywords = neoplasm (Clic here for more details about this article) |
3/385. Malignant granular cell tumor at the retrotracheal space.We report a case of an extremely rare neoplasm, malignant granular cell tumor (MGCT). The patient was a 21-year-old woman, who was 5 months pregnant. The tumor occurred in the retrotracheal space, extending from the level of the larynx to the thoracic inlet. In addition, there were multiple, variable-sized tumor nodules within both lung fields on chest CT scan. Histologically, tissue biopsied from the periphery of the tumor consisted of solid sheets of large ovoid cells with ample, eosinophilic cytoplasm, eccentric nuclei, and prominent nucleoli. Each cell showed slight atypism of the nuclei. There was a focal necrosis at the periphery of the lesion. These cells stained strongly for S-100 protein, neuron-specific enolase (NSE) and CD68. On electron microscopy, the tumor cells contained autophagic vacuoles. The patient refused further treatment and died 7 months later. The exact cause of death was not known. Until now, the diagnosis of MGCTs has been made only when metastasis and an aggressive clinical course are identified, although some observers advocate that some histologic features such as nuclear pleomorphism, necrosis, and the presence of any mitotic activity are indicative of malignancy. These histologic findings are not easily detectable in every case of MGCT, as in our case. So the diagnosis of a MGCT should be considered in cases with aggressive clinical findings and some histologic features, such as necrosis, nuclear atypism, and mitotic activities, which could suggest the malignant behavior of this neoplasm.- - - - - - - - - - ranking = 0.4keywords = neoplasm (Clic here for more details about this article) |
4/385. Intensity-modulated radiotherapy: first results with this new technology on neoplasms of the head and neck.Intensity-modulated beam radiotherapy (IMRT) delivers a highly conformal, three-dimensional (3-D) distribution of radiation doses that is not possible with conventional methods. When administered to patients with head and neck tumors, IMRT allows for the treatment of multiple targets with different doses, while simultaneously minimizing radiation to uninvolved critical structures such as the parotid glands, optic chiasm, and mandible. With 3-D computerized dose optimization, IMRT is a vast improvement over the customary trial-and-error method of treatment planning. We retrospectively reviewed the charts of the first 28 head and neck patients at our institution who were treated with IMRT. All had head and neck neoplasms, including squamous cell carcinoma, adenoid cystic carcinoma, paraganglioma, and angiofibroma. Total radiation doses ranged from 1,400 to 7,100 cGy, and daily doses ranged from 150 to 400 cGy/day. A quality assurance system ensured that computer-generated dosimetry matched film dosimetry in all cases. For midline tumors, this system allowed us to decrease the dose to the parotid glands to less than 3,000 cGy. The incidence of acute toxicity was drastically lower than that seen with conventional radiotherapy delivery to similar sites. This is the first report of the application of IMRT strictly to head and neck neoplasms. We discuss the indications, technique, and initial results of this promising new technology. We also introduce the concept of the Simultaneous Modulated Accelerated radiation Therapy boost technique, which has several advantages over other altered fractionation schemes.- - - - - - - - - - ranking = 1.2keywords = neoplasm (Clic here for more details about this article) |
5/385. Fine needle aspiration biopsy of well-differentiated liposarcoma of the neck in a young female. A case report.BACKGROUND: Well-differentiated liposarcomas are low grade, nonmetastasizing, malignant neoplasms composed primarily of mature adipose tissue. They are uncommon in the head and neck. CASE: A 24-year-old female presented to the ears, nose and throat clinic for evaluation of a recent, rapidly growing neck mass on the right side. Fine needle aspiration (FNA) biopsy of the mass showed that the smears had fragments of connective tissue with a mixture of mature-appearing fat traversed by bands of fibrous collagen and vessels. Nuclei within the fat and fibrous bands were mildly irregular, hyperchromatic and enlarged, with one or two small nucleoli. Infrequently present but readily identified, lipoblasts were scattered throughout the aspirate smears. A diagnosis of "atypical lipomatous neoplasm" was rendered. Subsequently, the mass was surgically removed. On histologic examination, the tumor was a well-differentiated liposarcoma. CONCLUSION: FNA biopsy of well-differentiated liposarcomas in the head and neck can present difficulties in the classification and diagnosis of this neoplasm.- - - - - - - - - - ranking = 0.6keywords = neoplasm (Clic here for more details about this article) |
6/385. Histologic transformation of polymorphous low-grade adenocarcinoma of salivary gland.Polymorphous low-grade adenocarcinoma of salivary gland origin (PLGA) was initially described in 1984 and has since become an established clinicopathologic entity. Owing to the indolent nature of PLGA and its relatively recent description, the full clinicopathologic spectrum of this entity has not been elucidated fully. Transformation to a histologically different-appearing lesion or progression to a higher histologic grade has not been reported. We describe 2 PLGAs arising in the palate and associated with multiple locoregional recurrences that were treated with excision and radiation therapy. This was followed by histologic transformation to a higher grade neoplasm after 17 and 26 years, respectively. The histologic appearance after transformation was characterized by a predominantly solid and cystic growth pattern, nuclear atypia with prominent nucleoli, and foci of necrosis. High-grade transformation of PLGA may occur after a protracted clinical course with multiple recurrences of typical PLGA. The possible role of radiation therapy as an initiator of this transformation merits further study. Tumors with these histologic features should not be included under the rubric of typical PLGA. Segregation of these neoplasms will allow further study of their biologic potential, particularly with regard to possible increased rates of local recurrence and metastasis.- - - - - - - - - - ranking = 0.4keywords = neoplasm (Clic here for more details about this article) |
7/385. Infantile fibromatosis of the neck with intracranial involvement: MR and CT findings.CT and MR imaging studies were performed in a 3-year-old boy with infantile fibromatosis arising from the infratemporal fossa and extending into the middle cranial fossa. On CT scans, the lesion was hyperattenuating (44-49 Hounsfield units [HU]), enhancing significantly after application of contrast material (63-66 HU). The MR images showed a multilobulated lesion of heterogeneous signal intensity. The tumor was markedly hypointense on T2-weighted images and slightly hypointense on T1-weighted images relative to brain tissue, iso- or slightly hyperintense relative to tongue muscle on both T2- and T1-weighted images, and enhanced strongly after administration of gadopentetate dimeglumine.- - - - - - - - - - ranking = 0.0001234923941989keywords = brain (Clic here for more details about this article) |
8/385. meningioma after radiotherapy for Hodgkin's disease.The most common second primary tumors after treatment of childhood Hodgkin's disease are leukemia, lymphoma, breast cancer, soft tissue sarcoma, and thyroid cancer. Although intracranial meningioma has been reported after radiotherapy to the scalp for benign conditions and for intracranial primary brain tumors, this appears to be an extremely rare sequelae of treatment for Hodgkin's disease. The authors describe a 15-year-old boy who underwent radiotherapy for Hodgkin's disease and in whom a meningioma developed in the posterior fossa 27 years later.- - - - - - - - - - ranking = 0.0001234923941989keywords = brain (Clic here for more details about this article) |
9/385. Benign mesenchymoma of the cheek: report of a case and review of the literature.Benign mesenchymoma is a soft tissue neoplasm that contains 2 or more differentiated mesenchymal components in addition to fibrous tissue. A rare case of benign mesenchymoma of the cheek in a 6-year-old boy is presented. The literature pertaining to mesenchymoma in the head and neck region is reviewed and discussed.- - - - - - - - - - ranking = 0.2keywords = neoplasm (Clic here for more details about this article) |
10/385. A review of heterotopia and associated salivary gland neoplasms of the head and neck.Salivary tissue neoplasms may involve normal, accessory and heterotopic salivary gland tissue. A case of Warthin's tumour originating from heterotopic salivary gland tissue of the upper neck is reported. The radioactive uptake of 131I, evidenced in the neck mass in its pre-diagnostic assessment, suggested a diagnosis of cervical node involvement from a primary malignant thyroid neoplasm. A critical review of the literature on heterotopic salivary gland tissue neoplasms of the head and neck is also presented.- - - - - - - - - - ranking = 1.4keywords = neoplasm (Clic here for more details about this article) |
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