A 24-year-old male presented with a subcutaneous tumour measuring approximately 10 cm in diameter on his left thigh. The tumour appeared firm on palpation and did not show epidermal alterations (figure 1A). The patient reported that the lesion had been slowly growing in size over a period of a few months. He denied symptoms such as pain, itching or bleeding. Since the patient had already been diagnosed with neurofibromatosis type 1 (NF1) several years before, and since he suffered from multiple [...]