Many neurosurgical diseases have no symptoms or atypical symptoms in the early stages, and thus are often prone to underdiagnosis or misdiagnosis, such as some of the following: 1, dementia in the elderly may be caused by hydrocephalus Many elderly people, as they grow older, symptoms such as memory loss, walking slower, and some are accompanied by urinary incontinence, many families mistakenly believe that this is the reason for getting older. In fact, these may be signs of dementia. However, not all elderly people with dementia are Alzheimer’s disease, there are also patients with hydrocephalus, although the incidence of this part is relatively low, but due to the increasing proportion of the elderly population in China, the incidence is also increasing. 2, finger numbness, beware of Arnold-Chiari malformation When there is numbness in the shoulder, and then extended to the arm, or even finger numbness, many people will think that it may be caused by cervical spondylosis. In fact, the presence of asymmetrical finger numbness, especially single finger numbness that gradually spreads to other fingers, should be kept alert and a neurological surgery visit should be made as soon as possible. The numbness of the fingers of both hands may be caused by internal diseases such as diabetes, but asymmetric finger numbness may be caused by cervical spinal cord diseases, such as spinal cord cavitation caused by Azi’s malformation. 3, buttocks “tail” Some babies are found to have a “small tail”, subcutaneous lumps, hair or small pits and nests in the midline of the buttocks after birth, and parents usually look for pediatric surgery. In fact, a “tail on the buttocks” is most likely to be a spinal cord embolism. If spinal cord embolism is not treated in time, children will grow up with lower limb pain, lameness, scoliosis, difficulty in size and even renal insufficiency and other symptoms. Doctor’s tip: the occurrence of the above symptoms, should consider neurosurgery consultation, the earlier the detection, the better the treatment effect.