We report the case of a 40-yr-old man presenting with symptoms of small bow
el obstruction, Small bow el x-rays revealed a stricture of the mid-jejunum
, Push enteroscopy found a polypoid mass at 1 meter of the ligament of Trei
tz, Histopathological examination of the biopsy and surgical specimens show
ed a diffuse infiltrate of the mucosa made of medium to large cells, which
were stained on immunohistochemistery by the leucocyte marker CD45 and the
histiocyte/monocyte marker CD68 but were negative for the B and T cell mark
ers. Cytological examination of the ascitic fluid revealed many myelobasts
with cytoplasmic Auer rods and positive myeloperoxidase staining. There was
no evidence of blood or bone marrow involvement suggestive of acute leukem
ia or myeloproliferative disorders. These findings were consistent with the
diagnosis of preleukemic granulocytic sarcoma (or chloroma), Chemotherapy
led to complete remission, but 21 months later the patient developed an acu
te myeloid leukemia, He died from arpergillus pneumonitis, 10 months after
bone marrow allograft, Preleukemic granulocytic sarcoma of the small bowel
is a rare condition and its diagnosis is usually not easy, requiring histoc
hemical or immunohistochemical studies. Most cases have progressed to acute
myeloid leukemia. (C) 1998 by Am. Cell, of Gastroenterology.