Ads
related to: pituitary microadenoma definition and treatment guidelines mayo clinic pictures
Search results
Results From The WOW.Com Content Network
Most pituitary adenomas are microadenomas and have an estimated prevalence of 16.7% (14.4% in autopsy studies and 22.5% in radiologic studies). [ 2 ] [ 4 ] The majority of pituitary microadenomas remain undiagnosed, and those that are diagnosed are often found as an incidental finding and are referred to as incidentalomas .
Hyperpituitarism is a condition due to the primary hypersecretion of pituitary hormones; [3] [medical citation needed] it typically results from a pituitary adenoma.In children with hyperpituitarism, disruption of growth regulation is rare, either because of hormone hypersecretion or because of manifestations caused by local compression of the adenoma.
Nelson's syndrome is a disorder that occurs in about one in four patients who have had both adrenal glands removed to treat Cushing's disease. [1] In patients with pre-existing adrenocorticotropic hormone ()-secreting pituitary adenomas, loss of adrenal feedback following bilateral adrenalectomy can trigger the rapid growth of the tumor, leading to visual symptoms (e.g. bitemporal hemianopsia ...
Examples of pituitary defects include hypopituitarism and pituitary hypoplasia. An example of a hypogonadism resulting from the lack of hormone response is androgen insensitivity syndrome , where there are inadequate receptors to bind the testosterone, resulting in varying clinical phenotypes of sexual characteristics despite XY chromosomes.
The pituitary gland consists of two parts, the anterior (front) and posterior (back) pituitary. Both parts release hormones that control numerous other organs. In pituitary apoplexy, the main initial problem is a lack of secretion of adrenocorticotropic hormone (ACTH, corticotropin), which stimulates the secretion of cortisol by the adrenal ...
Other hormone-secreting cells of the pituitary undergo rapid growth in pregnant women as well, which contribute to the gland's enlargement. [10] The anterior pituitary is supplied by a low pressure portal venous system. [15] The anterior pituitary is more commonly affected in Sheehan's syndrome because of the structure of the portal venous system.
Pituitary adenylate cyclase-activating polypeptide, also known as PACAP, is a protein that in humans is encoded by the ADCYAP1 gene. [ 5 ] [ 6 ] PACAP is similar to vasoactive intestinal peptide . One of its effects is to stimulate enterochromaffin-like cells .
Treatment of macroorchidism depends on pathogenesis. Surgical removal of the tumor is the most important and advised option for treating macroorchidism caused by non-functioning pituitary macroadenoma. [12] A non-functioning pituitary adenoma is a kind of benign tumor that does not secrete active hormones, and is from the pituitary gland. [13]