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Peripheral blood lymphocyte appearance in a case of I cell disease

Department of Clinical Chemistry, University Hospital Nijmegen St Radboud, 6500 HB Nijmegen, The Netherlands
Department of Paediatrics, University Hospital Nijmegen St Radboud
Department of Pathology, University Hospital Nijmegen St Radboud

Dr de Keijzer, CKCL (564), University Medical Centre St Radboud, PO Box 9101, 6500 HB Nijmegen, The Netherlands R.deKeijzer{at}ckcl.azn.nl In general, peripheral blood smears are performed to obtain information with regard to various morphological features as an aid in the diagnosis of infection or malignancy. This report presents a patient with I cell disease (inclusion cell disease), a fatal lysosomal storage disorder caused by a defect in an enzyme responsible for the transfer of mannose-6-phosphate ligands to precursor lysosomal enzymes. As a consequence, most lysosomal enzymes are transported outside the cell instead of being correctly targeted into the lysosomes, resulting in the storage of macromolecules in lysosomes. I cell disease, with its heterogeneous clinical presentation, can be diagnosed by the presence of intracellular vacuole-like inclusions in lymphocytes and fibroblasts, high serum lysosomal enzyme activities, and a defect of N-acetylglucosamine-1-phosphotransferase. This report describes the morphological aspects of peripheral lymphocytes in a blood smear of a patient, the first clue to the final diagnosis of I cell disease. The observed vacuole-like inclusions in lymphocytes of this patient were negative for periodic acid Schiff (PAS) and Sudan black B staining, in contrast to earlier reports.

Key Words: I cell disease • inclusion bodies • lymphocytes

This article has been cited by other articles:

				W. van der Meer, W. van Gelder, R. de Keijzer, and H. Willems The divergent morphological classification of variant lymphocytes in blood smears J. Clin. Pathol., July 1, 2007; 60(7): 838 - 839. [Full Text] [PDF]