To access imaging findings of growing teratoma syndrome (GTS), which is a rare complication of malignant ovarian germ cell tumor (GCT) after chemotherapy.
Five patients met the criteria for GTS. Computed tomography and magnetic resonance images were retrospectively reviewed by 2 radiologists in consensus for margin, attenuation, and the presence of gross fat or calcification of GTS lesions, which were compared with primary GCTs regarding tumor composition.
Growing teratoma syndrome lesions were characterized as follows: poorly circumscribed, diffuse peritoneal masses in 2 patients; well-circumscribed, localized peritoneal masses in 1 patient, and ovarian masses in 2 patients. Features more noticeable in GTS lesions were more prominent fatty components in 4 patients and purely cystic lesion in 1 patient.
Growing teratoma syndrome can be manifested as intraperitoneal masses with an increased fatty or cystic component. Radiologists should consider GTS when there are such masses on follow-up imaging studies in patients with malignant ovarian GCT.