Growing teratoma syndrome in mixed hepatoblastoma with teratoid features.

Mixed epithelial mesenchymal (MEM) hepatoblastoma with teratoid features is rare histological variant of hepatoblastoma and described in case reports. Growing teratoma syndrome (GTS) is a rare and often unrecognised phenomenon generally associated with less than 5% of germ cell tumour. It is defined by enlarging tumour mass which is generally mature teratoma with normal or significantly decreasing tumour markers during chemotherapy. The treatment outcomes in GTS are dependent on early recognition and complete surgical excision. We describe a rare case of MEM hepatoblastoma with teratoid features with GTS in an infant who had a delay in definitive management due to late diagnosis of GTS. © BMJ Publishing Group Limited 2021. No commercial re-use. See rights and permissions. Published by BMJ.