事实上，成功地施行手术治疗的病例少的可怜。
In fact, there have been very few reports of successful surgical treatment.
尽管对动物突触的研究提示PSD可能在人类疾病中扮演重要角色，但是真正在人类病例中对PSD的研究却是少之又少。
Although studies of animal synapses have indicated that the PSD could be important in human diseases and behaviour, surprisingly little was known about it in humans.
将这部分（病人的）收入拿走，医生们只剩下利润少的复杂的病例。
Take away this revenue and doctors will be left with only complicated cases that yield less profit.
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