Seminoma is one type of testicular cancer that's believed to originate from the germinal epithelium of the seminiferous tubules. Presentation They produce bulky masses that can be up to ten times the size of a normal testis. Diagnosis and have been proposed as possible markers. Peak incidence occurs in the 4th decade of life. Histology shows large cells, clear cytoplasm, distinct cell membranes, and septated arcitecture. Treatment In recent years, these tumors have been shown to have dramatic s… (More on Seminoma)