Retiform pattern, i.e., a growth pattern resembling rete ovarii/rete testis, is a sex cord-like pattern which can be found Sertoli–Leydig cell tumors, especially in DICER1-mutant cases (which tend to be more aggressive than DICER1-wild-type cases) [1,37]. The gene discussed is DICER1; the disease is Leydig cell tumor.