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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 151 (1992), S. 218-220 
    ISSN: 1432-1076
    Keywords: Vitamin B12 ; Methylmalonic aciduria ; Newborn screening ; Cobalamin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We describe two asymptomatic newborns with nutritional vitamin B12 deficiency in whom increased urinary methylmalonic acid was detected by routine neonatal screening at 3 weeks of age. Both infants were exclusively breast-fed. One mother suffered from pernicious anaemia, and the other was a strict vegetarian. Both mothers had no clinical or haematological abnormality, aside from a borderline mean corpuscular volume for the vegetarian mother. This report illustrates the early appearance of functional vitamin B12 deficiency in breastfed infants of vitamin B12-depleted mothers. It also demonstrates that urinary methylmalonic acid measurement is a sensitive indicator of tissue vitamin B12 deficiency.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-9949
    Keywords: Lymphoma ; Hypercalcemia ; 1,25-Dihydroxyvitamin D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We report two patients with non-Hodgkin's lymphoma in whom hypercalcemia and elevated 1,25 dihydroxyvitamin D (1,25-(OH)2D3) levels developed in the absence of any lytic bone lesions. Hypercalcemia responded only transiently to glucocorticoids which were ill tolerated. Intravenous APD administration was needed to circumvene hypercalcemia. Humoral hypercalcemia of malignancy is discussed. Our cases confirm that hypercalcemia associated with elevated 1,25-(OH)2D3 may occur in malignant lymphoma.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-198X
    Keywords: Key words Uremia ; Homocysteine ; Cerebrovascular disease ; Thermolabile methylenetetrahydrofolate reductase variant ; Cystinosis ; Folic acid ; Vitamin B12
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  We report a 13-year-old girl with nephropathic cystinosis on chronic peritoneal dialysis who presented with two episodes of stroke. Laboratory evaluation showed severe hyperhomocysteinemia (108 µmol/l). Further testing revealed that she was homozygous for the thermolabile variant of the methylenetetrahydrofolate reductase (MTHFR) gene. Treatment with folic acid and vitamin B12 lowered plasma homocysteine to less than 20 µmol/l. No further episodes of stroke occurred over a follow-up of 12 months. Homocysteine levels should be measured in patients with chronic renal failure, since simple and safe treatment with folic acid and vitamin B12 is effective in lowering the plasma homocysteine level in patients with the thermolabile MTHFR allele.
    Type of Medium: Electronic Resource
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