Below are the main types of pituitary tumors.

  • Nonfunctional adenomas (null cell adenomas) These tumors are the most common type.
  • Prolactin-producing tumors (prolactinomas) These benign tumors are also common.
  • ACTH-producing tumors.
  • Growth hormone-producing tumors.

What are chromophobe cells?

Chromophobe cells are one of three cell stain types present in the anterior and intermediate lobes of the pituitary gland, the others being basophils and acidophils. Together, these epithelial cells are responsible for producing the hormones of the anterior pituitary and releasing them into the bloodstream.

How can you tell if a pituitary tumor is benign or malignant?

MRI or CT scans can detect tumors in the pituitary gland. And blood and urine tests can determine hormone levels. Even under a microscope, it’s difficult to recognize the difference between a cancerous and a noncancerous pituitary tumor.

What does a pituitary tumor headache feel like?

Headache pain in these situations is typically characterized by steady, bifrontal or unilateral frontal aching (ipsilateral to tumor). In some instances, pain is localized in the midface (either because of involvement of the second division of the trigeminal or secondary to sinusitis).

What is a chromophobe adenoma?

Chromophobe adenomas vary in size, often reaching 0.5 cm in diameter. Grossly, the tumors are soft and dark red due to prominent hemorrhagic areas. They are well circumscribed and, because of their size, often compress adjacent brain tissue and induce hydrocephalus.

Where is the pars nervosa located?

the posterior pituitary
Pars nervosa. Also called the neural lobe or posterior lobe, this region constitutes the majority of the posterior pituitary and is the storage site of oxytocin and vasopressin. Sometimes (incorrectly) considered synonymous with the posterior pituitary, the pars nervosa includes Herring bodies and pituicytes.

What kind of headache does a pituitary tumor cause?

Generally, indirect effects of pituitary tumors are caused by reduced secretion of pituitary hormones, and are manifested by promotion of “vascular” headaches (e.g. migraine).

Can you live a normal life with a pituitary tumor?

In general, when a pituitary tumor is not cured, people live out their lives but may have to deal with problems caused by the tumor or its treatment, such as vision problems or hormone levels that are too high or too low.

Can an eye exam detect a pituitary tumor?

Because of their effects on vision, eye doctors may be the first to diagnose a pituitary adenoma. To measure the extent of vision loss, eye doctors usually order a computerized visual field test. Because some pituitary tumors can cause hormonal changes, a complete medical history is also taken.

What are pituitary chromophobe adenomas?

Pituitary chromophobe adenomas are the most common source of pituitary-related problems. An adenoma is a benign or noncarcinogenic glandular tumor. They rarely secrete any hormones (occasionally GH and rarely PRL, TSH, or ACTH), and their effects usually are due to pressure on the brain or optic chiasm caused by growth of the tumor.

What is chondromophobe adenoma?

chromophobe adenoma. a nonfunctional pituitary tumor of the pars distalis is hormonally inactive but commonly causes clinical signs by compression of the pituitary gland and other nearby structures.

What is chromophobe carcinoma?

chromophobe carcinoma. rare nonfunctional pituitary tumors are usually large and invasive causing destruction of the pars distalis leading to panhypopituitarism and diabetes insipidus. There is extensive invasion of the brain and cranial bones, and metastases to spleen and liver and to regional lymph nodes may occur.

What is the prevalence of pituitary adenoma in children?

Only 2–6% of all pituitary adenomas occur in childhood and adolescence. Most pituitary adenomas occurring before adulthood are prolactinomas, with GH-secreting adenomas and chromophobe adenomas being the next most common.