It will be recalled that two types of pentosuria1 exist: (1) the alimentary type, characterized by the presence of optically active xylose or arabinose in the urine, which follows the ingestion of large amounts of pentose-containing foods2 such as apples, cherries, plums, beets and leguminous vegetables, and (2) the idiopathic, or essential, pentosuria.
Salkowski and Jastrowitz3 first described a case of essential pentosuria in a morphin addict who also occasionally excreted a trace of glucose. In this type of pentosuria, r-arabinose, an optically inactive pentose, is usually excreted. Janeway4 was able to compile from the literature twenty-four of these cases up to the year 1906.
In the two cases of chronic pentosuria that have come under my observation, the patients were:
Mrs. A., Jewish, aged 30, who was told twelve years ago that small amounts of sugar were present in the urine. At no time has
Rosenbloom J. REPORT OF A CASE OF ESSENTIAL PENTOSURIA IN BROTHER AND SISTER. JAMA. 1923;80(4):250. doi:10.1001/jama.1923.26430310002011b
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