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Michael E. Kallen, MD

Academic Title:

Associate Professor

Primary Appointment:


Administrative Title:

Associate Director of the Pathology Residency Program



Phone (Primary):


Phone (Secondary):




Education and Training

Surgical Pathology Assistant - Johns Hopkins Hospital. July 2017 – June 2018.

Clinical Fellow – Hematopathology. National Institutes of Health / National Cancer Institute. July 2015 – June 2017.

Chief Resident - Anatomic and Clinical Pathology.  David Geffen School of Medicine, University of California Los Angeles.  July 2014 - June 2015.

Resident – Anatomic and Clinical Pathology. David Geffen School of Medicine, University of California Los Angeles. July 2011 – June 2015.

MD – Vanderbilt University School of Medicine. 2007 - 2011.

BS – Chemical Biology. University of California Berkeley. 2003 – 2007.

Research/Clinical Keywords

Sarcoma, leukemia, lymphoma, myelodysplastic syndrome

Highlighted Publications

Nageshwar M, Duong VH, Koka R, Singh Z, Kallen ME.  Chronic myelomonocytic leukemia in a patient with a germline predisposition and short telomeres.  AJSP: Reviews & Reports. Nov/Dec 2019; 24(6):255-259.

Hittman J, Nageshwar M, Duong VH, Lee ST, Koka R, Singh Z, Kallen ME.  Unclassifiable myelodysplastic / myelproliferative neoplasm with hypocellularity: A classification conundrum.  AJSP: Reviews & Reports. Nov/Dec 2019; 24(6):263-266.

Mininni J, Singh Z, Strauch E, Macatangay RA, Kallen ME.  Warthin–Finkeldey-like cells in a lymph node from a child with Li-Fraumeni syndrome.  J Hematopathol. 2019 Dec; 12(4):215-6.

Merechi F, Koka R, Singh Z, Lee ST, Kallen ME.  Transformed mycosis fungoides and mimics: exploring the landscape of CD30+ cutaneous T-cell lymphomas.  AJSP: Reviews & Reports. Sept/Oct 2019; 24(5):196-200.

Alqaidy D, Kallen ME, Singh Z, Wilding E. Transformed Nodular Lymphocyte-Predominant Hodgkin Lymphoma: Histologic Features and Relationship to T-Cell/Histiocyte–Rich Large B-Cell Lymphoma.  AJSP: Reviews & Reports. Sept/Oct 2019; 24(5):201-206.

Kallen ME, White R, Hittman J, Hatten KM, Stashek KM, Staats PN, Papadimitriou JC. Incidental Collision Tumor: Two Common Metastases Meet in the Neck.  AJSP: Reviews & Reports. Jan/Feb 2019; 24(1):19-21. 

Kallen ME, Dulau-Florea A, Wang W, Calvo KR. Acquired and germline predisposition to bone marrow failure: Diagnostic features and clinical implications. Semin Hematol. 2019 Jan;56(1):69-82.

Kallen ME, Alexanian S, Said J, Quintero-Rivera F. Triple Hit Lymphoma: Rare Cases With Less Dire Than Usual Prognosis. Int J Surg Pathol. 2016 Dec;24(8):709-714.

Kallen ME, Naini BV. Intraductal Oncocytic Papillary Neoplasms of the Pancreas. Arch Pathol Lab Med. 2016 Sep;140(9):992-6.

Kallen ME, Sim MS, Radosavcev BL, Humphries RM, Ward DC, Apple SK. A quality initiative of postoperative radiographic imaging performed on mastectomy specimens to reduce histology cost and pathology report turnaround time. Ann Diagn Pathol. 2015 Oct;19(5):353-8.

Kallen ME, DeNicola MM, Said J. Coexpression of cytokeratin and B-cell markers – a rare finding with new implications. J Hematopathol. 2015 Jun; 8(2):95-97.

Kallen ME, Pullarkat ST. Type II bare lymphocyte syndrome: role of peripheral blood flow cytometry and utility of stem cell transplant in treatment. J Pediatr Hematol Oncol. 2015 May;37(4):e245-9.

Kallen ME, Kulkarni SK, Rao NP, Pullarkat ST, Said J, Tirado CA, Ahmed R, Miller JM, Chung PY, Kahn DG, Song SX. B-lymphoblastic transformation of mantle cell lymphoma/leukemia with “double hit” changes. J Hematopathol. 2015 Mar; 8(1):31-36.

Kallen ME, Boon-Unge K, Yong WH, Pope WB, Frazee JG, Vinters HV. Isolated choroid plexus granulomas: initial presentation of neurosarcoidosis? Can J Neurol Sci. 2014 Jan;41(1):112-4.

Kallen ME, Sanders ME, Gonzalez AL, Black JO, Keedy VL, Hande KR, Homlar KC, Halpern JL, Holt GE, Schwartz HS, Coffin CM, Cates JM. Nuclear p63 expression in osteoblastic tumors. Tumour Biol. 2012 Oct; 33(5): 1639-44.

Kallen ME, Nunes Rosado FG, Gonzalez AL, Sanders ME, Cates JM. Occasional staining for p63 in malignant vascular tumors: a potential diagnostic pitfall. Pathol Oncol Res. 2012 Jan; 18(1): 97-100.

Clinical Specialty Details

  • Hematopathology
  • Bone and soft tissue pathology
  • Surgical pathology