Abstract
Myelofibrosis is characterized by stem cell-derived clonal proliferation potentially resulting in bone marrow fibrosis. As the disease progresses, extramedullary hematopoiesis is frequently detected in the spleen and the liver but rarely in other organs. We report a case of a 68-year-old woman with myelofibrosis with a JAK2 mutation, showing extramedullary hematopoiesis (EMH) in various organs with a marked increase in reticulin fibers, and myeloproliferative neoplasm (MPN)-related necrotizing crescent glomerulonephritis. She was admitted to our hospital owing to respiratory discomfort. Computed tomography revealed a mass in the anterior mediastinum. Ten days later, the patient died owing to respiratory distress. At autopsy, EMH were detected in the anterior mediastinum, heart, lung, spleen, and the kidney with a marked increase in reticulin fibers. We considered that respiratory distress was partially caused by EMH. In the kidney, necrotizing crescent glomerulonephritis was observed. Immunohistochemically, the glomerular basement and mesangial area were IgA- and C3d-positive. Ultrastructural examination revealed the presence of dense deposits in the subendothelial space and the mesangial and paramesangial areas. Thus, we suspected that MPN-related necrotizing crescentic glomerulonephritis harbored a pathogenesis similar to that of IgA-dominant post-infectious glomerulonephritis or IgA nephropathy. This case report could widen the spectrum of MPN- or EMH-related lesions.
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Abbreviations
- ANCA:
-
Antineutrophil cytoplasmic antibodies
- EMH:
-
Extramedullary hematopoiesis
- GBM:
-
glomerular basement membrane
- HE:
-
Hematoxylin–eosin
- Ig:
-
Immunoglobulin
- MF:
-
Myelofibrosis
- MPN:
-
Myeloproliferative neoplasm
- MPO:
-
Myeloperoxidase
- PAM:
-
Periodic acid–methenamine silver
- PAS:
-
Periodic acid–Schiff
- TMA:
-
Thrombotic microangiopathy
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Acknowledgements
We thank Ms. Aoyama and Ms. Adachi for assistance in the preparation of the images for immunohistochemistry and electron microscopy.
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HW, FF, and NF participated in writing of the manuscript and in preparing the figures. ST, KJ, and HS reviewed the manuscript.
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795_2021_300_MOESM1_ESM.tiff
Supplementary file1 Additional File 1 contains Supplementary Figure 1, showing microscopic findings of the spleen. (a) Hematoxylin–eosin (HE) staining showing the foci of hemorrhage and (b) silver impregnation revealing increases in reticulin fiber (a and b: scale bar = 5 mm). (c and d) High-power view of the selected area (red square) in a and b, respectively (c and d: scale bar = 100 μm). (c) HE staining showing extramedullary hematopoiesis including dysplastic megakaryocytes (blue arrow) and (d) silver impregnation revealing mild increases in reticulin fiber. (e and f) High-power view of the selected area (blue square) in a and b, respectively (e and f: scale bar = 100 μm). (e) HE staining showing hemorrhage including erythroblastic islands (blue arrow) and (f) silver impregnation revealing a marked increase in reticulin fiber (TIFF 33972 kb)
795_2021_300_MOESM2_ESM.tiff
Supplementary file2 Additional File 2 contains Supplementary Figure 2, showing microscopic findings of the spleen, heart, and kidney. Masson–Goldner stain revealing increases in collagen fiber (a) around the hematoma (red arrow) in the spleen, (b) in the cardiac adventitia, and (b) in the sinus fat of the kidney where extramedullary hematopoiesis was observed (scale bar = 100 μm) (TIFF 33972 kb)
795_2021_300_MOESM3_ESM.tiff
Supplementary file3 Additional File 3 contains Supplementary Figure 3 showing microscopic findings of the mass on the anterior mediastinum. (a) Silver impregnation showing increases in reticulin fiber around the hematoma (red arrow) in the mass (scale bar = 1 mm). (b) High-power view of the selected area (red square) in a (scale bar = 500 μm). Silver impregnation revealing a marked increase in reticulin fiber on the periphery of the mass (TIFF 33972 kb)
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Watanabe, H., Fujishima, F., Fukuhara, N. et al. Advanced extramedullary hematopoiesis with a marked increase in reticulin fibers and hemorrhage on various organs: the first autopsy case report. Med Mol Morphol 55, 68–75 (2022). https://doi.org/10.1007/s00795-021-00300-x
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DOI: https://doi.org/10.1007/s00795-021-00300-x