Visual disturbances associated with primary empty sella syndrome in patients with chronic renal failure.

After describing the main clinical features of primary empty sella syndrome and the main hormonal alterations in chronic renal failure, the authors report the results obtained in a group of 33 patients undergoing dialysis three times a week. Each patient had a complete ophthalmologic examination, with electroretinography and visual-evoked potentials, a complete radiologic examination, including skull stratigraphy (particularly of the sellar and parasellar bony structures), and a computed tomographic scan. In the whole group, visual acuity, ocular and lid motility, and visual fields were normal. In two patients, a slight bilateral papilledema, associated with a P100 latency increase and normal morphology and visual-evoked potentials, was reported. Two patients had initial unilateral papillary pallor associated with P100 amplitude alterations. In all four of these patients, radiologic examination showed a markedly pathologic sellar widening with thickening and double contour image of the floor. The report of a primary empty sella was confirmed by computed tomography in all four cases. The authors discuss the possible etiopathogenic mechanisms of the neuroophthalmologic symptoms associated with this syndrome.