Fanconi's syndrome with hepatorenal glycogenosis associated with phosphorylase b kinase deficiency.

OBJECTIVE

To describe two patients with Fanconi's nephropathy secondary to glycogen storage disease and speculate on the possible etiology.

DESIGN

Convenience sample.

SETTING

Tertiary care, referral center.

PATIENTS

Two related children referred for failure to thrive, rickets, and hepatomegaly.

INTERVENTION

Dietary and therapeutic measures for rickets and renal tubular acidosis.

MEASUREMENTS AND RESULTS

The main laboratory findings were fasting hypoglycemia and massive glucosuria, with evidence of multiple renal tubular dysfunction characteristic of the Fanconi syndrome. Liver and kidney biopsy specimens were consistent with glycogen storage disease. Enzymatic assay of liver homogenates revealed marked deficiency of phosphorylase b kinase in one patient and absent activity in the other.

CONCLUSION

Phosphorylase b kinase deficiency may be causally related to hepatorenal glycogenosis with the Fanconi syndrome. More patients with this syndrome need to be studied before a definitive causal role is implicated.