The clinical data are useful in the diagnosis of impotence. The pharmacological erection test was not found to be very reliable. Complete neuroandrologic evaluation is indicated in non typified and mixed impotence, and can be performed in neurogenic impotence to identify the level of the lesion. Alone, SPACE does not appear to be useful as a screening test for neurologic lesions, but can be useful as a screening test for neuromuscular cavernous lesions. SPACE is indicated in structural, vascular and hormonal impotence. If SPACE is abnormal, the differential diagnosis between neurogenic and myogenic lesion can be made through a complete neuroandrologic evaluation.