Thoracic Sertoli-Leydig cell tumor: An alternative type of pleuropulmonary blastoma associated with DICER1 variation

Pediatr Blood Cancer. 2021 Nov;68(11):e29284. doi: 10.1002/pbc.29284. Epub 2021 Aug 16.


A 2-year-old boy presented with a large cystic and solid chest mass arising from the lung, radiographically consistent with pleuropulmonary blastoma (PPB). He underwent right lower lobectomy with resection of a well-circumscribed, mixed solid and cystic mass. The solid areas were composed of cords and nests of tumor cells in the myxoid stroma and retiform foci whose pathologic and immunophenotypic findings were consistent with a sex cord-stromal tumor with features of a Sertoli-Leydig cell tumor. Tumor testing showed a pathogenic variant in the DICER1 RNase IIIb hotspot domain. Family history was suggestive of DICER1 germline pathogenic DICER1 variation in absence of a detectable germline variant. He received 12 cycles of chemotherapy with ifosfamide, vincristine, dactinomycin and doxorubicin (IVADo) and surgery with complete response. One year after completion of chemotherapy, imaging studies showed concern for recurrence confirmed by thorascopic biopsy of a pleural-based mass. He is currently receiving cisplatin-based chemotherapy with reduction in tumor size. Review of the literature showed no similar cases; however, review of our pathology files revealed a single similar case of anterior mediastinal Sertoli cell tumor in a 3-year-old girl.

Keywords: DICER1; Sertoli-Leydig cell tumor; pleuropulmonary blastoma; thoracic tumor.

Publication types

  • Case Reports
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Child, Preschool
  • DEAD-box RNA Helicases / genetics
  • Female
  • Germ-Line Mutation
  • Humans
  • Male
  • Pulmonary Blastoma* / drug therapy
  • Pulmonary Blastoma* / genetics
  • Ribonuclease III / genetics
  • Sertoli-Leydig Cell Tumor* / drug therapy
  • Sertoli-Leydig Cell Tumor* / genetics


  • DICER1 protein, human
  • Ribonuclease III
  • DEAD-box RNA Helicases

Supplementary concepts

  • Pleuropulmonary blastoma