This is a malignant tumour of the sympathetic nervous system, located on the front of the spine.

It is relatively common (about 10% of tumours), and mainly affects very young children (average age: 2) and often behaves aggressively, when molecular markers are present (amplification of the MYCN proto-oncogene), in the form of bone metastases at diagnosis, or as the disease progresses. Radiation and surgery play only a complementary role in treatment that is mainly based on chemotherapy.

The position of proton therapy

When radiotherapy is indicated, the doses are relatively low, but the position of the tumour in contact with highly radiosensitive organs (kidneys, liver and spine) justifies its use, according to several dosimetry publications.

Schedule of irradiation

Daily sessions, spread over approximately 2 to 3 weeks.