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The biological potential of teratoma remains unpredictable, therefore identifying its presence in the retroperitoneum remains important. We evaluated patients undergoing post-chemothe rapy retroperitoneal lymphadenectomy (PC-RPLA) for nonseminomatous testicular tumors (NSTT), to determine predictors of teratomatous elements in the retroperitoneum. We identified 161 patients from 1982 to 2005 who underwent PC-RPLA for metastatic NSTT. Multiple clinical and pathological variables were reviewed from out RPLA database. Of the 161 patients in our series, 112 (70%) received only induction chemotherapy and 49 (30%) required 2nd line chemotherapy. Studies of retroperitoneal pathology demonstrated the presence of fibrosis in 44 (27%), teratoma in 82 (51%) and vital carcinoma in 35(22%).Among 82 patients (51%) with finding of teratomatous elements at PC-RPLA, we revealed the presence of mature teratoma in 85%, immature teratoma in 12% and teratoma with malignant transformation in 3%. Of the 99 patients (61%) with teratomatous elements in the primary NSTT, 61 (62%) had teratoma at PC-RPLA. Even in the absence of teratoma in the primary NSTT, teratoma was present in the retroperitoneum in 21 of 62 patients (32%) (p 5 cm in diameter occured in 30%, 52% and 55%, respectively. By multivariate analysis, teratoma in the orchiectomy specimen (p<0.005), relative change in nodal size before and after chemotherapy (p<0.005), and no requirement for 2nd line chemotherapy (p=0.33) were independent predictors for the presence of the teratoma in the retroperitoneum. Teratoma remains a common histologic finding in the retroperitoneal lymph nodes following chemotherapy. We have identified several pre-RPLA variables that predict the finding of teratoma in the retroperitoneum for men treated with chemotherapy for metastatic NSTT.

Can we predict the presence of teratoma in the retroperitoneum before post-chemotherapy retroperitoneal lymphadenectomy?