Low back hairline

Introduction More common in X chromosome abnormalities, congenital ovarian hypoplasia, skull bottom syndrome, cervical fusion syndrome and other low post-development.

Cause

May be caused by X chromosome abnormalities, congenital ovarian hypoplasia, skull base stagnation, cervical fusion syndrome.

an examination

1. There is a short neck, a low hairline, a head and neck slant, and an asymmetrical auricle.

2, secondary nerve damage showed occipital neck pain or hoarseness or limb weakness, urinary retention, ataxia and paroxysmal vertigo.

3, increased intracranial pressure, manifested as headache, vomiting, binocular papilledema.

4. X-ray photographs of the occipital region (including the tomographic slices) showed that the vertebral odontoids were 3 mm higher than the occipital occipital line, 9 mm from the basal line, and 12 mm above the second abdominal muscle groove.

5, gas cerebral angiography, iodophenyl ester spinal canal angiography, computed tomography to help understand the ventricular system and the large hole area of the occipital bone. Magnetic resonance examination revealed that the cerebellar tonsils were found below the occipital foramen and the ventricles were enlarged.

Differential diagnosis

1.x chromosomal abnormalities. X-trisomy: Women have three X chromosomes. They develop more slowly (but can be corrected by the addition of the day after tomorrow), with an average intelligence of 90, which is lower than the normal 100. They can give birth normally. More rare situations such as XXXX or XXXXX. XXY trisomy: Men have two X chromosomes. Their testosterone levels may be lower and their chest development is close to that of women. More rare situations such as XXXY or XXXXY. Turner syndrome: Women have only one X chromosome. They are short stature and their sexual function cannot develop normally.

2. Congenital ovarian hypoplasia. Congenital ovarian hypoplasia, also known as Turner syndrome, is a disease caused by congenital chromosomal abnormalities. The normal female chromosome is 46, XX. If the karyotype is 45, XO, that is, lack of a sex chromosome X, or 46, XXP or 46, XXq or its chimera, it can be diagnosed as DeN. Due to abnormal sex chromosomes, the ovary cannot grow and develop, so the ovary is a cord-like fibrous tissue with no primordial follicles and no eggs. The clinical features are short stature, the height of adulthood is rarely more than 150cm, the neck is low, even up to the shoulder, the neck is short and thick. More than half of the neck skin is slack, from the posterior mastoid to the shoulder peak, showing the neck, chest wide, shield-like, elbow valgus, nipple outward, congenital aortic stenosis, with amenorrhea and secondary sexual characteristics Not developed, the body's FSH increased, and estrogen was extremely low.

3. Skull base stagnation. Skull base stagnation refers to the inversion of the skull base tissue centered on the occipital foramen, and the upper cervical vertebrae such as the vertebral foramen and the odontoid process are in the cranium, resulting in a reduction in the volume of the posterior cranial fossa and shortening of the anterior and posterior diameter of the occipital foramen. Causes symptoms. Also known as the skull base or the skull base varus.

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