MPNSTs are important despite their low incidence because of their aggressiveness, and should be considered upon the detection of a mass located at paravertebral level or limbs, especially in patients with NF1. The cornerstone of the treatment lies in a complete surgical resection due to the high rate of recurrence, with limited therapeutic response to radiotherapy and chemotherapy. This case presents the clinical manifestations and complications that can be expected with these tumors and their harmful behaviour. The absence of NF1 does not exclude the diagnosis.
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