Solitary Benign Schwannoma Mimics Residual Malignancy on FDG PET/CT.

Schwannomas can be seen in pediatric patients with neurofibromatosis and occur generally in the limbs. Solitary schwannoma rarely occurs in pediatric patients who do not have neurofibromatosis. A 15-year-old girl with Hodgkin lymphoma in the neck underwent follow-up FDG PET/CT scan to monitor the response to the chemotherapy. Although her lesions in the neck were no longer visualized, one focal activity in her left upper back persisted. Excisional biopsy result demonstrated benign schwannoma.