Reactive lymphoid follicular hyperplasia mimicking a peripheral nerve tumor.

Background: Reactive lymphoid follicular hyperplasia is a benign proliferation of lymphoid follicles, which can develop wherever lymphoid tissue is present. We present the unique case of an RLFH that involved the radial nerve and presented as a peripheral nerve tumor.

Case Description: A 62-year-old woman came to our attention because of the evidence of a mass in her right arm, associated with numbness in the lateral aspect of her right arm and forearm.