December 2020 — Hematopathology

A 73 year old male with no underlying illness presented with watery diarrhea, bloating and intermittent abdominal pain. He was initially scheduled to have colonoscopy; however, he developed bowel perforation which required an exploratory laparotomy. A segment of the small bowel was resected.

H&E x 4
H&E x 40
CD3 x4
CD8 x4
CD56 x 4
TCR-Delta X4

What is the most likely diagnosis?

  • Enteropathy-associated T-cell lymphoma
  • Inflammatory bowel disease
  • Monomorphic epitheliotropic intestinal T-cell lymphoma
  • Indolent T-cell lymphoproliferative disorder of the gastointesinal tract

The correct answer is...

The correct answer is Monomorphic epitheliotropic intestinal T-cell lymphoma

Monomorphic epitheliotropic intestinal T-cell lymphoma (MEITL) is a primary intestinal T-cell lymphoma derived from the intraepithelial lymphocytes. Unlike enteropathy associated T-cell lymphoma, it is not associated with celiac disease and lacks an inflammatory background. The neoplastic cells have medium-sized nuclei with disepersed chromatin and moderate pale eosinophilic to clear cytoplasm. Epitheliotropism is usually prominent. MEITL has a distinctive phenotype with positive expression for CD3, CD8 and CD56 and is usually T-cell receptor (TCR) gamma-delta derived. MEITL prognosis is poor with a median survival of 7 months.

References
1. Swerdlow SH, Campo E, Harris NL, eds. WHO classification of tumours of haematopoietic and lymphoid tissues. 4th ed. Lyon, France: IARC; 2017.​

Photo of Majd Jawad, M.D. Majd Jawad, M.D.
Resident, Hematopathology
Mayo Clinic
@MajdJawad10
Photo of Adam Wood, D.O. Adam Wood, D.O.
Consultant, Hematopathology
Mayo Clinic
Assistant Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine and Science

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