PMC2822429_01
(a) T2-weighted sagittal magnetic resonance image of the thoracolumbar spine showing the isointense extradural lesion (arrow) causing thecal sac and spinal cord compression and signal intensity changes within the cord. (b) The T2-weighted axial image showing thecal and spinal cord compression (curved arrow) by the extradural lesion (straight arrow)
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T2-signal intensity changes within the cord [Figure 1a and b]. There was no evidence of caseation or necrosis within the lesion.
(a) Myeloid cells (arrow) admixed with erythroid cells and megakaryocytes (H and E, x40). (b) Increased reticulin (arrow) on bone marrow biopsy (Retic x40)
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The histopathology of the lesion showed a vaguely nodular collection of hematopoietic cells comprising of various stages of erythroid cells, myeloid cells and megakaryocytes with an intertraversing sinusoidal capillary network [Figure 2a]. Reticulin staining showed focally increased fibrosis [Figure 2b].