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• W2895535510 abstract "Melanotic neuroectodermal tumor of infancy (MNTI) is a rare pigmented tumor of the head and neck, which most commonly presents during the first year of life. Most cases present in the bones of the craniofacial region, including the maxilla (60.3%), skull (18.1%), and mandible (10.3%). The alveolar crest of the anterior maxilla is the most common site. MNTIs are locally aggressive, but benign, lesions derived from neural crest cells. However, they have a high rate of recurrence, and ≤6.5% of cases will demonstrate metastasis to lymph nodes or distant organs. They present clinically as an expansile pigmented mass. Radiographically, these lesions are often intraosseous expansile lytic lesions that can envelope or displace teeth. Extraosseous components might be better visualized on magnetic resonance imaging, demonstrating an enhancing iso- or hypointense mass on T1- and/or T2-weighted imaging. MNTIs have a distinctive biphasic cell population composed of large pigmented epithelial cells and small blue neuroblastic cells. Many immunohistochemical markers have also been identified. The large cell population often expresses cytokeratins, HMB-45, and vimentin; S100 is much less common. The small cell population typically expresses synaptophysin but will be negative for another neuroendocrine marker, chromogranin A. Rarely, patients will have elevated levels of urine vanillylmandelic acid, similar to findings from other tumors of neuroectodermal origin, such as neuroblastomas. First-line treatment of these lesions should be surgery with the goal of complete local excision. Radiotherapy and chemotherapy have been described but have been largely used as adjuvant or neoadjuvant therapy and for metastatic disease. We present a case of MNTI in an 8-week-old male, who had presented with a nonpigmented mass of the mandible associated with a pathologic fracture. In addition to a review of the data, our case serves to highlight potential prognostic factors, current clinical management, and local complications of this rare tumor. Melanotic neuroectodermal tumor of infancy (MNTI) is a rare pigmented tumor of the head and neck, which most commonly presents during the first year of life. Most cases present in the bones of the craniofacial region, including the maxilla (60.3%), skull (18.1%), and mandible (10.3%). The alveolar crest of the anterior maxilla is the most common site. MNTIs are locally aggressive, but benign, lesions derived from neural crest cells. However, they have a high rate of recurrence, and ≤6.5% of cases will demonstrate metastasis to lymph nodes or distant organs. They present clinically as an expansile pigmented mass. Radiographically, these lesions are often intraosseous expansile lytic lesions that can envelope or displace teeth. Extraosseous components might be better visualized on magnetic resonance imaging, demonstrating an enhancing iso- or hypointense mass on T1- and/or T2-weighted imaging. MNTIs have a distinctive biphasic cell population composed of large pigmented epithelial cells and small blue neuroblastic cells. Many immunohistochemical markers have also been identified. The large cell population often expresses cytokeratins, HMB-45, and vimentin; S100 is much less common. The small cell population typically expresses synaptophysin but will be negative for another neuroendocrine marker, chromogranin A. Rarely, patients will have elevated levels of urine vanillylmandelic acid, similar to findings from other tumors of neuroectodermal origin, such as neuroblastomas. First-line treatment of these lesions should be surgery with the goal of complete local excision. Radiotherapy and chemotherapy have been described but have been largely used as adjuvant or neoadjuvant therapy and for metastatic disease. We present a case of MNTI in an 8-week-old male, who had presented with a nonpigmented mass of the mandible associated with a pathologic fracture. In addition to a review of the data, our case serves to highlight potential prognostic factors, current clinical management, and local complications of this rare tumor." @default.
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• W2895535510 date "2019-02-01" @default.
• W2895535510 modified "2023-09-26" @default.
• W2895535510 title "Melanotic Neuroectodermal Tumor of Infancy: Case Report and Review of Management" @default.
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• W2895535510 doi "https://doi.org/10.1016/j.joms.2018.09.033" @default.
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