Malignant peripheral nerve sheath tumors (MPNSTs) are a complex group of malignant tumors originating from nerve cells or benign peripheral nerve sheath tumors and are commonly found in major plexus/nerve root sites such as the limbs. head. and neck. Malignant peripheral nerve sheath tumors originating in the ureter are extremely rare. https://mabelandfoxs.shop/product-category/glitter-globe/