Abnormal endocrine indices and myopathy have been variably present in two brothers with Bloom's syndrome (congenital teleangiectatic erythema, hypersensitivity to light, and growth retardation). These consisted of: (1) growth retardation with height and weight below the third centiles; in the younger one at age 14, hypoglycaemia failed to elicit a rise in growth hormone but did so in the older one at age 17; (2) serum TSH was raised in the older one in whom serum FSH and LH were also above the normal range; and (3) myopathy characterised by pronounced dilatation of the sarcoplasmic reticulum was present in the younger one; distinct reduction of muscle strength was shown in his older brother with ultrastructural alteration of skeletal muscle of unknown significance.
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