What is a T1 hyperintensity?
T1 signal hyperintensity is a common finding at magnetic resonance imaging of the sellar region. However, this signal intensity pattern has different sources, and its significance depends on the clinical context.
What does a bright spot on the pituitary gland mean?
An ectopic posterior pituitary bright spot can be seen in patients with congenital pituitary hypoplasia and associated growth hormone deficiency. There may be associated hypoplasia or absence of the adenohypophysis and pituitary infundibulum.
Why is posterior pituitary hyperintense on T1?
The posterior pituitary bright spot, having intrinsically high signal on T1 weighted images is believed to be from the storage of vasopressin, which has a T1-shortening effect 2.
What causes T1 hyperintensity?
Hyperintense cerebral changes on T1-weighted images are formed due to accumulation of substances characterized by short longitudinal relaxation time including: gadolinium contrast, intra- and extracellular methemoglobin, melanin, fatty and protein-rich substances and minerals, i.a. calcium, copper and manganese.
What is T1 hypointense on MRI?
Abstract. T1 -hypointense lesions (T1-black holes) in multiple sclerosis (MS) are areas of relatively severe central nervous system (CNS) damage compared with the more non-specific T2-hyperintense lesions, which show greater signal intensity than normal brain on T2-weighted magnetic resonance imaging (MRI).
What is pituitary MRI?
A pituitary MRI (magnetic resonance imaging) is an imaging test that makes pictures of the pituitary gland (small gland in the brain that controls hormones and other glands in the body) and surrounding areas in the brain.
What are the symptoms of a tumor in the pituitary gland?
Pituitary tumors that make hormones (functioning) can cause a variety of signs and symptoms depending on the hormone they produce….Signs and symptoms include:
- Nausea and vomiting.
- Weakness.
- Feeling cold.
- Less frequent or no menstrual periods.
- Sexual dysfunction.
- Increased amount of urine.
- Unintended weight loss or gain.
What does hypointense T1 and T2 mean?
T1 lesions were defined as regions with a signal intensity similar to or reduced to the signal intensity of gray matter and corresponding to a hyperintense region on T2-weighted MRI. Hyperintense–T2 lesions were defined as sharply demarcated regions of high signal intensity compared with surrounding brain tissue.