Observational Case Summary: Clinical and Radiological Changes During Multimodal Treatment of High-Risk Neuroblastoma

When a young boy was diagnosed with high-risk metastatic neuroblastoma affecting his lower limb, his parent faced an overwhelming journey. The tumour had already caused extensive destruction of the limb and surrounding soft tissues. Genetic testing identified features associated with more aggressive disease.

Over the next several months, he underwent multiple cycles of intensive high dose chemotherapy and immunotherapy. Despite these treatments, follow-up MRI scans in showed continued disease progression. The tumour became larger, soft tissue involvement increased, and new infiltration into surrounding tissues was observed. The treatment itself was also extremely difficult. During therapy, he developed severe complications including septic shock and multiple bloodstream infections. His appetite declined, mobility worsened, and he often required tube feeding.

During a later phase of treatment, the patient continued receiving oncology care while ECCT was used as a complementary therapy. During the same treatment period, radiological and clinical changes were documented.

An MRI performed approximately two months later demonstrated a reduction in tumour size, a decrease in the active tumour component, and evidence of tumour necrosis. The scan also noted new bone formation, which may represent healing changes within the affected lower limb. Subsequent PET-CT imaging performed approximately three months later showed further encouraging findings. The tumour's metabolic activity had decreased substantially, with SUVmax reducing from 6.4 at diagnosis to 1.8. No new FDG-avid metastatic lesions were identified.

Beyond the scans, the family also observed positive changes in daily life. His appetite improved, sleep quality became better, and he appeared more active and comfortable.

While multiple therapies were used together and individual contributions cannot be separated, this case describes a period during which objective radiological improvement and clinical progress were documented while multiple therapies were being used concurrently. As several treatments were administered during the same period, the contribution of any individual therapy cannot be determined.

Disclaimer: This case summary is presented for educational and informational purposes only. Personal details have been modified or omitted to protect privacy.