a.胚細胞腫瘍 Germ cell tumors 
              1)精細管内胚細胞腫瘍 Intratubular malignant germ cells, ITMGC 
                2)単一組織型 Tumors of one histological type, pure forms 
              ①セミノーマ Seminoma 
                亜型:合胞性栄養膜細胞を伴うセミノーマ 
                (Seminoma with syncytiotrophoblastic cells) 
              ②精母細胞性セミノーマ Spermatocytic seminoma 
                亜型:肉腫を伴う精母細胞性セミノーマ 
                (Spermatocytic seminoma with sarcoma) 
              ③胎児性癌 Embryonal carcinoma 
              ④卵黄嚢腫瘍 Yolk sac tumors 
              ⑤多胎芽腫 Polyembryoma 
              ⑥絨毛性腫瘍 Trophoblastic tumors 
                a)絨毛癌 Choriocarcinoma 
                b)胎盤部栄養膜細胞性腫瘍 Placental site trophoblastic tumor 
              ⑦奇形腫 Teratomas 
                a)成熟奇形腫 Mature teratoma 
                皮様奇形腫 Dermoid cyst 
                b)未熟奇形腫 Immature teratoma 
                c)悪性部分を伴う奇形腫 Teratoma with malignant area 
              3)混合型 Tumors of more than one histological type, mixed forms 
              b.性索/間質腫瘍 Sex cord/gonadal stromal tumors 
              1)単一型 Pure forms 
              ①ライディック細胞腫 Leydig cell tumor 
              ②セルトリ細胞腫 Sertoli cell tumor 
                亜型:a)大細胞性石灰化セルトリ細胞腫 Large cell calcifying Sertoli cell tumors 
                b)高脂質性セルトリ細胞腫 Lipid-rich Sertoli cell tumors 
              ③顆粒膜細胞腫 Granulose cell tumor 
                a)成人型顆粒膜細胞腫 Adult type granulose cell tumor 
                b)若年型顆粒膜細胞腫 Juvenile type granulose cell tumor 
              ④莢膜細胞腫/線維腫群腫瘍 Tumors of the thecoma/fibroma group 
              2)不完全分化型性索・性腺間質腫瘍 
                Incompletely differentiated sex cord/gonadal stromal tumors 
                3)混合型 Mixed forms 
                4)分類不能型 Unclassified forms  |