RT Journal Article SR Electronic T1 Granulocytic sarcoma of the rectum: a rare complication of myelodysplasia. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 865 OP 866 DO 10.1136/jcp.52.11.865 VO 52 IS 11 A1 Dabbagh, V A1 Browne, G A1 Parapia, L A A1 Price, J J A1 Batman, P A YR 1999 UL http://jcp.bmj.com/content/52/11/865.abstract AB A 67 year old man with myelodysplasia was admitted as an emergency with a six week history of rectal bleeding and diarrhoea. Barium enema showed an irregular polypoid filling defect in the lateral wall of the proximal rectum near the rectosigmoid junction. Histology showed this to be a granulocytic sarcoma (extramedullary granulocytic leukaemia; chloroma) infiltrating the bowel. A low index of suspicion of this lesion results in an incorrect diagnosis in many such cases. A chloroacetate esterase immunoperoxidase stain will confirm the granulocytic nature of the tumour cells.