Oral plexiform neurofibroma not associated with neurofibromatosis type I: case report.

An unusual case of isolated plexiform neurofibroma arising in the oral cavity without other clinical manifestations or family history of neuro-fibromatosis-1 (NF-1) is described. The tumor was histopathologically analyzed and an immunohistochemical panel comprising S-100 protein, epithelial membrane antigen (EMA), collagen IV, and CD34 was performed. Typical features of plexiform neurofibroma characterized by enlarged nerve fascicles composed of elongated nuclei and scant cytoplasm cells were identified. Subjacent to the oral epithelium, tactile-like bodies were also detected. On the basis of this report, we would like to emphasize that plexiform neurofibroma can occur in the oral cavity as a benign isolated tumor in patients without other stigmata of NF-1.