7 August 2008 – Case of the Week #126
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We thank Dr. Renuka Agrawal, Loma Linda University Medical Center, California (USA) for contributing this case and much of the discussion. To contribute a Case of the Week, email NatPernick@Hotmail.com with the clinical history, your diagnosis and diagnostic microscopic images in JPG, GIF or TIFF format (send as attachments, we will shrink if necessary). Please include any other images (gross, immunostains, etc.) that may be helpful or interesting. We will write the discussion (unless you want to), list you as the contributor, and send you $35 (US dollars) by check or PayPal for your time after we send out the case. Please only send cases with high quality images and a diagnosis that is somewhat unusual (or a case with unusual features).
Case of the Week #126
A 19 year-old Hispanic man presented with hypertension and renal insufficiency (serum creatinine of 7.1 mg/dl). The peripheral blood smear showed pancytopenia but no circulating blasts. A CT scan (image) demonstrated bilateral renal enlargement with lymphadenopathy in the retroperitoneum and neck.
What is your diagnosis?
Pre-B acute lymphoblastic lymphoma involving the kidneys
A bone marrow biopsy was also obtained (image), which showed a diffuse infiltration by tumor cells with a similar morphology as the renal biopsy.
The renal biopsy showed a diffuse infiltrate of monotonous blastoid cells obliterating the normal renal architecture. The bone marrow biopsy showed a similar population of cells replacing most of the marrow. Immunophenotyping by flow cytometry and immunohistochemistry showed that the tumor cells co-express CD19, CD20, CD10, CD34, CD38, CD79a, HLA-DR and TdT.
Precursor B-cell acute lymphoblastic leukemia/lymphoma (ALL) is a common pediatric hematologic malignancy. Although renal failure due to tumor lysis is a recognized complication of treatment, initial presentation with renal failure is distinctly uncommon. ALL must be considered among the causes of acute renal failure when the kidneys are enlarged. Careful morphologic study and immunophenotyping by flow cytometry or immunohistochemistry is helpful to arrive at the correct diagnosis, and to avoid confusion with other small blue cell tumors which may involve the kidney, such as Wilm’s tumor (J Pediatr Hematol Oncol 2008;30:471), small cell carcinoma or Ewing’s sarcoma/primitive neuroectodermal tumor.
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7. PathologyOutlines.com - Leukemia, Acute chapter
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