Myeloid sarcoma with monocyte precursors in urinalysis precipitate

Abstract

Myeloid sarcoma is an extramedullary lesion consisting of either differentiated or nondifferentiated myeloblasts. We encountered an unusual case in which we detected abnormal cells in urinalysis precipitate, which differed from normal blood and epithelial cells. The monocyte precursor could not be identified in routine screening, but further investigation of the literature led to its identification, which led to the diagnosis of myeloid sarcoma. The detection of monocyte precursors in urinalysis precipitate is rare and thus its identification is difficult. However, in our case, we successfully identified the precursor.