This case presented as an unknown case with a suspected pelvic mass, but with further questioning, the patient had cutaneous manifestations of neurofibromatosis. Viewing the unusual abdominopelvic findings with this lens, it becomes clear - there is a large, plexiform neurofibroma in the right subdiaphragmatic space, numerous other neurofibromas with some plexiform branching into the upper right thigh, and finally the left pelvic mass which appears more aggressive and irregular than these other processes. This raises concern of malignant transformation - e.g. a malignant peripheral nerve sheath tumor, and requires further evaluation with biopsy.