{Reference Type}: Case Reports
{Title}: Alpha-fetoprotein-elevated postpubertal testicular teratoma with retroperitoneal metastasis on 18F-FDG PET/CT: case report and literature review.
{Author}: Jiao H;Qiu Y;Huang W;Zhang Y;Chen Z;Wang A;Kang L;
{Journal}: Front Med (Lausanne)
{Volume}: 10
{Issue}: 0
{Year}: 2023
{Factor}: 5.058
{DOI}: 10.3389/fmed.2023.1269587
{Abstract}: Postpubertal testicular teratoma exhibits malignant biological behavior and has metastatic potential. We report a case of a 17-year-old patient diagnosed with postpubertal testicular teratoma with massive retroperitoneal metastasis. The pathological examination revealed a mature teratoma without any other components. However, the patient had a significantly increased level of AFP, and 18F-FDG PET/CT showed the retroperitoneal metastasis had increased FDG uptake, with a SUVmax of 15.6, suggesting the coexistence of other germ cell tumor components, and the patient might have a poor prognosis. After resection of the retroperitoneal tumor, PET/CT further revealed multiple abdominal and pelvic metastases, with a SUVmax of 22.5. Therefore, the patient received a cycle of chemotherapy and follow-up PET/CT imaging showed the achievement of complete metabolic response after the treatment. In this case, PET/CT played a crucial role in detecting metastasis, compensating for the limitations of pathological sampling, thus establishing a definitive diagnosis and predicting prognosis. And it was evident that PET/CT also has the advantage of evaluating therapeutic efficacy.