Mikako Warren, MD

Mikako Warren, MD

Director of Electron Microscopy
Pediatric Pathologist
Attending Physician
Associate Professor of Clinical Pathology, Keck School of Medicine of USC
Clinical Interests

Dr. Warren is board certified in Anatomical and Clinical Pathology, Pediatric Pathology and Molecular Genetic Pathology. In addition to making diagnosis on routine surgical specimens, she is also specialized to read kidney biopsy and perform electron microscopic examination.


Medical School

Yamaguchi University, School of Medicine


University of Hawaii School of Medicine (Pediatrics)


University of Hawaii School of Medicine (Anatomic Pathology and Clinical Pathology)


Baylor College of Medicine, Texas Children's Hospital (Molecular Genetic Pathology, Pediatric Pathology)



American Board of Pathology: Anatomic Pathology, Clinical Pathology and Pediatric Pathology, Molecular Genetic Pathology

Professional Memberships
  • College of American Pathology
  • United States & Canadian Academy of Pathology
  • Association of Molecular Pathology
  • Society for Pediatric Pathology
  • Society of Ultrastructural Pathology


Warren M, Mitsinikos T, Yanni G, Sasaki M, Sasaki AT, Thomas D. Mycophenolate Mofetil Hepatotoxicity Associated with Mitochondrial Abnormality in Liver Transplant Recipients and Mice. J Pediatr Gastroenterol Nutr. 2021 May 18. Epub ahead of print. PMID: 34016874.

Warren M, Tiwari N, Sy S, Raca G, Schmidt RJ, Pawel B. PLAG1 immunohistochemical staining is a surrogate marker for PLAG1 fusions in lipoblastomas. Pediatr Dev Pathol. 2022 Mar-Apr;25(2):134-140. PMID: 34601996.

Kapur RP, Bellizzi AM, Bond S, Chen H, Han JS, LeGallo RD, Midgen C, Poulin AA, Uddin N, Warren M, Velázquez Vega JE, Zuppan CW. Congenital Myenteric Hypoganglionosis. Am J Surg Pathol. 2021 Aug 1;45(8):1047-1060, PMID: 33492848

Warren M, Takeda M , Partikian A, Opas L, Fine R, Yano S. Association of a de novo nonsense mutation of the TRIM8 gene with childhood-onset focal segmental glomerulosclerosis. Pediatr Nephrol. 2020 Jun;35(6):1129-113, PubMed PMID: 32193649.

Alturkustani M, Shillingford N, Zhou S, Wang L, Warren M. Phox2b Immunohistochemical Staining in Detecting Enteric Neural Crest Cells in Hirschsprung Disease. Pediatr Dev Pathol. 2021 Jan-Feb;24(1):19-26. PMID: 32975470.

Jodele S, Dandoy CE, Lane A, Laskin BL, Teusink-Cross A, Myers KC, Wallace GH, Nelson A, Bleesing J, Chima RS, Hirsch R, Ryan TD, Benoit SW, Mizuno K, Warren M, Davies SM. Complement blockade for TA-TMA: lessons learned from large pediatric cohort treated with eculizumab. Blood. 2020 Jan 13;. doi: 10.1182/blood.2019004218. [Epub ahead of print] PubMed PMID: 31932840.

Warren M, Shimura M, Wartchow EP, Yano S. Use of electron microscopy when screening liver biopsies from neonates and infants: experience from a single tertiary children's hospital (1991-2017). Ultrastruct Pathol. 2020 Jan 3;:1-10. doi: 10.1080/01913123.2019.1709934. [Epub ahead of print] PubMed PMID: 31900039.

Warren M, Hiemenz MC, Schmidt R, Shows J, Cotter J, Toll S, Parham DM, Biegel JA, Mascarenhas L, Shah R. Expanding the spectrum of dicer1-associated sarcomas. Mod Pathol. 2020 Jan;33(1):164-174. doi: 10.1038/s41379-019-0366-x. Epub 2019 Sep 19. PubMed PMID: 31537896.

Mahajan N, Warren M, Yano S. Reduction of large soft-tissue Gaucheromas with substrate reduction therapy. J Inherit Metab Dis. 2019 Nov 9;. doi: 10.1002/jimd.12188. [Epub ahead of print] PubMed PMID: 31705761.

Narang A, Xi D, Mitsinikos T, Genyk Y, Thomas D, Kohli R, Lin CH, Soufi N, Warren M, Merritt R, Yanni G. Severe Late-Onset Acute Cellular Rejection in a Pediatric Patient With Isolated Small Intestinal Transplant Rescued With Aggressive Immunosuppressive Approach: A Case Report. Transplant Proc. 2019 Nov;51(9):3181-3185. doi: 10.1016/j.transproceed.2019.08.012. PubMed PMID: 31711586.


Dr. Warren's research interests are broad and include general pediatric pathology, cancer genetics, and ultrastructural pathology.