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A 79-year-old womansuffering from urinary incontinence and unsteady gait was diagnosed as having idiopathic normal pressure hydrocephalus (NPH) with hyponatremia due to the syndromeof inappropriate secretion of antidiuretic hormone(SIADH).The concentration of antidiuretic hormone was high while the plasma osmolality was low in the presence of concentrated urine during the episodes of hyponatremia. Magnetic resonance imaging (MRI) of the head showed enlargement of the third and lateral ventricles. After ventriculoperitoneal shunt surgery, the symptoms of NPHand hyponatremia improved. It may be possibly explained that mechanical pressure on the hypothalamus from the third ventricle is responsible for hyponatremia. (Internal Medicine 38: 290-292, 1999)

Wedescribe six elderly cases of acute myositis with type A influenza virus infection (Sydney) during the 1998-1999 outbreak. All six cases suffered from myalgia or muscle weakness especially in the lower extremities and the serum creatine kinase (CK) values were elevated above 1,000 IJJ/l without MBisoenzymes or electrocardiogram abnormalities. There have been a few case reports of acute myositis associated with influenza virus infection in the elderly. However, we noticed a high incidence of acute myositis among elderly patients with type A influenza virus infection. This complication mayoccur more commonlyin elderly patients than has previously been thought.

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