Histopathological Analysis in Testicular Tumors: 10 Years of Experience

. This study aims to review the morphological and immunohistochemical features of testicular tumors and compare them with prognostic parameters. . Testicular tumors diagnosed between January 2011 and September 2021 were reviewed. Patient age, tumor subtype, size, spread, lateralization, number of foci, and immunohistochemical results were recorded. . A total of 121 tumors were detected, of which 108 (89%) were germ cell tumors (GCTs). Of the germ cell tumors, 70 (65%) were found to be pure type, and 38 (35%) were mixed germ cell tumors. The ratio of pure seminoma among GCTs was 56/108 (52%). Lymphatic/vascular invasion (LVI) was detected in 48/121 (40%), rete testis invasion in 32/121 (26%), hilar soft tissue invasion in 10/121 (8%), epididymal invasion in 5/121 (4%), and spermatic cord invasion in 5/121 (4%) patients. Lymphatic/vascular invasion was observed in 6 (22%) of 27 germ cell tumors smaller than 3 cm in size, and rete testis invasion was observed in 2 (7%), while in 40 (55%) of the 73 germ cell tumors of 3 cm and above, lymphatic/vascular invasion was seen, and 26 (36%) of them had rete testis invasion. Immunohistochemical results contributed significantly to the determination of tumor components and rates, especially in mixed germ cell tumors. . Most of the tumors were germ cell tumors, and the majority were seminomas. Lymphatic/vascular invasion and rete testis invasion rates increase as the tumor diameter increases, which is more evident when the 3 cm cut-off value is taken into account ( < 0.005).