Growing teratoma syndrome (GTS) is a rare condition seen in patients with germ-cell tumors (GCT) who present with enlarging masses during or after appropriate chemotherapy with normalized serum markers.1 Three defining criteria for GTS are: a persistently growing tumor mass or evolving new mass during or after chemotherapy, normalization of tumor markers, and presence of only mature teratoma in the resected specimen on the final histopathological examination.1 Growing teratomas lack the metastatic potential; however, their relentless local growth causes compression and infiltration of adjacent organs, which produces symptoms.
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