• OBJECTIVE: The aim of this systematic review was to determine the computed tomographic (CT) imaging characteristics of maxillary and mandibular melanotic neuroectodermal tumor of infancy (MNTI). (bvsalud.org)
  • The most common odontogenic tumors were adenomatoid odontogenic tumor and ameloblastoma (10.5% each). (bvsalud.org)
  • While most tumors metastatic to the serous membranes are of epithelial origin, cytologists should be aware that non-epithelial neoplasms can also cause malignant effusions including sarcomas, melanomas, germ cell tumors, and, more rarely, brain tumors. (cytojournal.com)
  • Diagnosing non-epithelial malignancies in effusion specimens based entirely upon their cytomorphologic features is difficult because these neoplasms often exhibit considerable morphological overlap and their cytomorphology can differ from the original tumor. (cytojournal.com)
  • As malignant cells have a tendency to round up in body fluids these non-epithelial neoplasms can therefore mimic reactive mesothelial cells and metastatic adenocarcinoma. (cytojournal.com)
  • Most tumors metastatic to the serous membranes are of epithelial origin. (cytojournal.com)
  • Common non-epithelial neoplasms that may cause malignant effusions include malignant melanoma, sarcomas, and other neoplasms including germ cell tumors [ Figure 1 ]. (cytojournal.com)
  • Other rare non-epithelial malignancies that may be encountered in effusion cytology include neuroblastoma, Wilms tumor, and metastatic brain tumors. (cytojournal.com)
  • 4 Malignant effusions caused by non-epithelial neoplasms are more frequently encountered in children than in adults. (cytojournal.com)
  • The classification of epithelial tumors of the kidney has in particular undergone substantial progress in the last two decades with major contributions from genetic typing of renal cell carcinomas (RCCs). (abdominalkey.com)
  • more precisely, a benign epithelial neoplasm consisting of villous or arborescent outgrowths of fibrovascular stroma covered by neoplastic cells. (lookformedical.com)
  • The differential diagnosis of a malignant effusion is accordingly broad, especially for the small round blue cell tumors that includes not only mesenchymal tumors, but also non-mesenchymal tumors, such as neuroblastoma and Wilms tumor. (cytojournal.com)
  • A somewhat similar lesion, congenital epulis, occurs less frequently than the granular cell tumor and occurs on the alveolar ridge of newborns. (medscape.com)
  • however, congenital epulis is negative for S-100 and other markers found in the granular cell tumor. (medscape.com)
  • Pseudoepitheliomatous hyperplasia, a frequent finding in granular cell tumors, generally is not present over the congenital epulis. (medscape.com)
  • Malignant congenital epulis has not been reported. (medscape.com)
  • The etiology of the granular cell tumor and congenital epulis is unknown. (medscape.com)
  • Malignant melanoma of the conjunctiva presents as a raised pigmented or non-pigmented lesion. (medscape.com)
  • Evidence indicates that approximately 20% to 25% of patients with conjunctival melanoma have a history or microscopic evidence of a benign conjunctival nevus. (medscape.com)
  • However, some uncertainty surrounds the role of nevi in the histogenesis of malignant melanoma. (medscape.com)
  • Granular cell tumors are uncommon lesions, although the head and neck region accounts for approximately 50% of all lesions. (medscape.com)
  • Malignant granular cell tumors are extremely uncommon, accounting for less than 2% of granular cell tumors. (medscape.com)
  • Oral granular cell tumor is too uncommon to accurately assess an incidence rate. (medscape.com)
  • INTRODUCTION: Benign intraosseous maxillary tumors, although uncommon among the adolescents, represent a major challenge to the maxillofacial surgeons. (bvsalud.org)
  • AIM OF THE WORK: To investigate the clinical and pathological patterns, treatment, and outcome of benign intraosseous maxillary tumors in adolescents. (bvsalud.org)
  • Pathological processes that tend eventually to become malignant. (lookformedical.com)
  • Granular cell tumors occur more commonly in blacks than in whites. (medscape.com)
  • 1 - 3 Intracranial brain tumors, most commonly medulloblastoma [ Figure 2 ], can metastasize to the peritoneal cavity via ventriculo-peritoneal shunts used to divert excess cerebrospinal fluid. (cytojournal.com)
  • 2] Granular cell tumor with an overlying squamous cell carcinoma has been reported. (medscape.com)
  • The role of genotyping and ancillary tools, in particular immunohistochemistry, in correctly classifying these tumors is highlighted in the section on Renal Cell Carcinoma. (abdominalkey.com)
  • Granular cell tumors occur twice as frequently in females than in males. (medscape.com)
  • Approximately 70% of oral granular cell tumors occur in the tongue. (medscape.com)
  • PATIENTS AND METHODS: A 10-years prospective study included patients between 12-18 years who presented with benign intraosseous maxillary tumors and surgically treated (conservative surgery or radical resection) with immediate reconstruction. (bvsalud.org)
  • BACKGROUND: The zygomatic implant perforated (ZIP) flap technique provides immediate reconstruction and rapid dental rehabilitation for low-level malignant tumors. (bvsalud.org)
  • As a general rule, the depth of biopsy for granular cell tumors approximates the diameter of the lesion. (medscape.com)
  • Wilms tumor often is greater than 5 cm in diameter, with an average size of 10 cm ( 3 ). (abdominalkey.com)
  • along with malignant melanomas, it is infrequent in the younger population. (medscape.com)
  • The first section will cover those tumors that characteristically are associated with the pediatric population. (abdominalkey.com)
  • Agents that reduce the frequency or rate of spontaneous or induced tumors independently of the mechanism involved. (lookformedical.com)
  • These melanocytic cells are of neuroectodermal origin, and melanocytic tumors may arise from these cells. (medscape.com)
  • Malignant melanomas arising from nevi (they may arise from junctional and compound nevi) usually appear as a change (increasing nodularity, variegated pigmentation, bleeding, or inflammation) in known pigmented lesions of the conjunctiva. (medscape.com)
  • A diverse array of tumors can arise in the human kidney. (abdominalkey.com)
  • Wilms tumor is believed to arise from embryonic tissues called nephrogenic rests that fail to undergo normal involution ( 7 ). (abdominalkey.com)
  • Granular cell tumors now generally are accepted as being of neural origin, either Schwann cell or neuroendocrine. (medscape.com)
  • Wiedemann-Beckwith syndrome is related to abnormalities on chromosome 11p15 and characterized by multiple craniofacial anomalies, abdominal wall defects, and tumors of the genitourinary tract, liver, adrenal gland, and central nervous system among other abnormalities. (abdominalkey.com)
  • Central giant cell granulomas and ossifying fibromas were the most common non-odontogenic tumors. (bvsalud.org)
  • Granular cell tumor. (medscape.com)
  • In 1926, Abrikossoff first described granular cell tumors. (medscape.com)
  • The age range for occurrence of granular cell tumors is from the second to the eighth decade, most frequently in the fourth and fifth decades. (medscape.com)
  • Granular cell tumors are slow-growing lesions (0.5-1 mm per year) that are neither painful nor tender. (medscape.com)
  • The head and neck region accounts for approximately 45-65% of all sites for granular cell tumors. (medscape.com)
  • A diagnosis of megaloblastic anemia was made based on the high levels of mean corpuscule volume and red cell distribution width, neutrophil hypersegmentation and cobalamin deficiency, and the patient was referred to a centre for hemotherapy and hematology. (9lib.co)
  • Specific discussions of etiology and pathogenesis are dealt with in each of the sections on individual tumors, rather than as a freestanding section, as is used elsewhere in this text. (abdominalkey.com)
  • The purpose of this chapter is to familiarize the reader with the tumor types encountered in the human rather than to provide a comprehensive diagnostic reference, which is better handled in more comprehensive textbooks and monographs. (abdominalkey.com)
  • This is a somewhat arbitrary designation, as most tumors can develop over a wide age range. (abdominalkey.com)