Although these diseases—many of which are hallmark tumors of DICER1 syndrome and rarely occur sporadically—have been known for several years, the more recent identification of DICER1 mutations in embryonal tumors with multilayered rosettes (ETMR) and DICER1-associated intra- and extracranial sarcomas has expanded the spectrum of tumor types potentially linked to DICER1 syndrome. The gene discussed is DICER1; the disease is sarcoma.