Pituitary adenomas are the most common tumors in the sellar region, especially in women of childbearing age. The main medical diagnosis usin
Pituitary adenomas are the most common tumors in the sellar region, especially in women of childbearing age. The main medical diagnosis using brain CT/MRI, the two main characteristics:
All of them were used as direct coronal dynamic contrast enhanced scanning
Adenomas showed a low density region, most of which were clear, and the tumors were round, oval or irregular. In addition some indirect signs can be used for reference, such as saddle bottom or local subsidence of bone resorption, pituitary stalk displacement, pituitary height increased (> 8mm). If the clinical symptoms are not typical, the blood test related hormone levels are not high, should follow up observation.
The coronal and sagittal slices were used to scan the T2WI, and the T1WI micro adenoma showed low signal area. Early enhancement of normal pituitary microadenoma, not enhanced with low signal, the late lesion density is higher than that of normal pituitary, so fast dynamic enhanced MRI can improve the detection rate of micro adenoma, the most sensitive method in operation for a variety of imaging technology. In addition, the indirect signs of CT displayed by the above MRI can be clearly displayed.
In addition to the above imaging examinations, pituitary adenomas were also associated with gender, age, tumor size, and direction of development, as well as the type of secretory hormones, including the following 4 groups of symptoms:
In 1, pituitary hormone secretion caused by too many common symptoms and signs for acromegaly, Cushing syndrome and prolactin.
2, the pituitary gland itself compression syndrome, mainly pituitary hormone secretion reduced, generally the first effects of growth hormone GH, followed by LH, FSH, and adrenocorticotropic hormone, thyroid stimulating hormone, a few may be associated with diabetes insipidus.
3, the pituitary tissue surrounding the compression symptoms, including headache, decreased visual acuity, visual field defect, hypothalamic syndrome and cerebrospinal fluid rhinorrhea etc..
In 4, pituitary apoplexy, a pituitary adenoma and / or pituitary infarction itself, necrosis or hemorrhage, clinical on can appear quickly compression symptoms and meningeal irritation symptoms, clinical manifestations of pituitary hyperfunction may disappear or reduce, or even the anterior pituitary hypofunction.