Original sentence: " (emphasis added).However, such cases account for only a small proportion of all those presenting with perineal pain and the proof of the diagnosis resting on relief of pain following decompression of the nerve in Alcock's canal is rarely achieved.However, the validity of decompression surgery as a treatment and the existence of entrapment as a cause of pelvic pain are highly controversial.Notably, in February 2003 the European Association of Urology in its Guidelines on Pelvic Pain said:.The value of the clinical neurophysiological investigations is debatable; some centres in Europe claim that the investigations have great sensitivity (1,2), while other centres, which also have a specialized interest in pelvic floor neurophysiology, have not positively identified any cases.While certain doctors will prescribe decompression surgery, others will not.the reality is that pudendal nerve neuropathy is probably only a likely diagnosis if the pain is unilateral, has a burning quality and is exacerbated by unilateral rectal palpation of the ischial spine, and the pudendal motor latency is delayed on that side only