Pituitary and Parasellar Tumors
Tumors and other growths that develop in or around the pituitary gland, where they can affect hormone function, vision, and nearby nerves and blood vessels.
Quick Answer
Pituitary and parasellar tumors are growths that develop in or around the pituitary gland at the base of the brain. The pituitary sits in a small bony pocket called the sella turcica; the parasellar region immediately around it contains the optic nerves, carotid arteries, nerves controlling eye movement, and the hypothalamus. Pituitary adenomas are the most common growths here, but craniopharyngiomas, Rathke’s cleft cysts, meningiomas, chordomas, and other conditions can occur in the same small space. Because different lesions can look similar on an initial scan, identifying the specific diagnosis is essential: some are observed, some treated with medication, some removed through the nose, and others treated with radiation or a combination of approaches.
Key Takeaways
- Pituitary adenomas are the most common growths in this region, but craniopharyngiomas, Rathke’s cleft cysts, meningiomas, chordomas, and other conditions also occur here.
- Different lesions can look similar on imaging, so identifying the specific diagnosis is one of the most important first steps.
- Symptoms commonly result from hormone overproduction, pressure on the optic nerves or nearby structures, or reduced function of the normal pituitary gland.
- Some conditions are treated primarily with medication, while others may require observation, surgery, radiation, or a combination.
- When surgery is needed, many tumors in this region can be reached endoscopically through the nose.
- Care commonly brings together skull base neurosurgery, ENT, endocrinology, and ophthalmology, with long-term hormone follow-up when needed.
At a Glance
| What it is | Tumors, cysts, and other growths in or around the pituitary gland |
|---|---|
| Most common type | Pituitary adenoma |
| Also found here | Craniopharyngioma, Rathke’s cleft cyst, meningioma, chordoma, chondrosarcoma, inflammation, and vascular lesions |
| Common effects | Hormone changes, vision loss, headaches, double vision, or reduced pituitary function |
| Shared evaluation | Dedicated pituitary MRI, hormone testing, and formal visual field testing when indicated |
| Treatment | Observation, medication, endoscopic surgery, craniotomy, or focused radiation depending on the diagnosis |
| Care model | Skull base surgical team working with endocrinology, ophthalmology, and other specialists as needed |
Where These Tumors Grow
The pituitary gland sits in a small bony pocket at the base of the skull called the sella turcica. The gland itself is about the size of a pea and connects to the brain by a thin stalk. Parasellar simply means the region immediately around the sella.
Above: Optic Nerves
The optic pathways cross directly above the pituitary. A growth extending upward can compress them and cause loss of peripheral vision.
Beside: Cavernous Sinuses
The carotid arteries and nerves controlling eye movement run on either side. Growth into this region can sometimes cause double vision or affect surgical options.
Above & Behind: Hypothalamus
The hypothalamus helps regulate appetite, weight, temperature, sleep, and thirst, making its relationship to a tumor important in treatment planning.
Below: Sphenoid Sinus
This air-filled sinus behind the nose provides a natural corridor that allows many tumors in this region to be reached endoscopically through the nostrils.
Why location matters: Several very different conditions can occupy this small space and produce overlapping symptoms. A growth that would cause few symptoms elsewhere may affect vision or hormone function here because critical structures are packed so closely together.
Growths Found in This Region
Several different conditions arise in and around the sella. On an initial MRI they can look similar, so the evaluation focuses not only on size and location but on determining what the growth actually is. Age, hormone results, and specific imaging features often narrow the diagnosis before tissue is needed.
Most Common in This Region
Pituitary Adenoma →
Arises from the hormone-producing cells of the pituitary gland and is by far the most common growth in this region. Some produce excess hormone; others are discovered after becoming large enough to affect vision or normal pituitary function.
Craniopharyngioma →
A rare, noncancerous tumor near the optic nerves and hypothalamus. It occurs in children and adults and includes two distinct tumor types with different molecular features and treatment considerations.
Rathke’s Cleft Cyst →
A benign, fluid-filled cyst formed from developmental tissue. Many are found incidentally and cause no symptoms, while larger cysts may affect vision or pituitary function.
Also Found in This Region
Skull Base Meningioma →
Meningiomas can arise along the floor of the skull near the sella and cavernous sinus. They commonly cause gradual vision changes and usually do not produce the hormone syndromes seen with pituitary tumors.
Chordoma & Chondrosarcoma →
Rare skull base tumors arising from bone or cartilage near the clivus. They can invade surrounding bone and often require specialized surgery, radiation, or both.
Other Conditions →
Not every mass is a tumor. Pituitary inflammation, other cysts, enlargement related to medical conditions, and abnormalities of nearby blood vessels can resemble a tumor on imaging.
Determining which condition is present — and whether it needs treatment at all — is the purpose of the evaluation described below.
Signs & Symptoms
Symptoms generally fall into three groups: hormone overproduction, pressure on nearby structures, and reduced output from the normal pituitary gland.
Hormone Overproduction
Some pituitary tumors produce excess hormones, causing changes in growth, metabolism, menstrual or reproductive function, or the effects of excess stress hormone.
Pressure on Nearby Structures
Compression of the optic pathways can cause loss of peripheral vision while central vision remains sharp. Growth toward the cavernous sinus can cause double vision, and headaches are common.
Reduced Pituitary Function
Compression of the normal gland can cause fatigue, low energy, cold intolerance, low libido, menstrual changes, and other nonspecific symptoms that may develop gradually.
Common Reasons for Evaluation
- Loss of side or peripheral vision
- Persistent headaches
- Double vision
- Unexplained hormone-related symptoms
- Fatigue or reduced pituitary function
Symptoms That Need Prompt Evaluation
- Sudden or rapidly worsening vision loss
- New severe double vision
- Sudden severe headache with neurological symptoms
- Confusion, fainting, or marked drowsiness
- Severe thirst and urination with dehydration
Diagnosis
Many growths in this region are evaluated using the same core information. The combination helps determine both what the lesion is and whether it needs treatment.
Dedicated Pituitary MRI
Thin-slice imaging focused on the sella provides more detail than a routine brain MRI and shows the lesion’s relationship to the gland, optic pathways, cavernous sinus, and nearby blood vessels.
Hormone Evaluation
Testing looks for both hormone overproduction and deficiency across the major pituitary systems. The pattern can provide an important clue to the diagnosis and identify problems that need treatment.
Formal Visual Fields
When a lesion approaches the optic pathways, formal testing maps peripheral vision that a standard eye chart does not measure.
Age and specific imaging features add further clues. Calcification, cystic components, the precise location of a solid mass, or a characteristic hormone pattern may strongly favor one diagnosis over another. Some lesions can be diagnosed and managed without a biopsy when the clinical and imaging findings are sufficiently characteristic.
Not every mass is a tumor. Inflammation, pituitary enlargement related to other medical conditions, and abnormalities of the nearby carotid arteries can sometimes resemble a pituitary-region tumor. Recognizing these possibilities before any procedure is an important part of the evaluation.
Treatment
Treatment depends on the specific diagnosis, tumor size and location, hormone activity, effects on vision, and involvement of nearby structures. Broadly, care may involve observation, medication, surgery, or focused radiation.
Observation
Small cysts or tumors that are not affecting hormones, vision, or nearby structures may need only periodic imaging and clinical follow-up.
Medication
Some diagnoses are treated primarily with medication. Prolactin-producing pituitary tumors, for example, often shrink with medical therapy and may not require surgery.
Surgery
Surgery may be recommended for lesions affecting vision, selected hormone-producing tumors, or other growths whose size, anatomy, or diagnosis makes removal appropriate.
Focused Radiation
Radiation may be used for selected residual, recurrent, or otherwise difficult-to-treat tumors when additional surgery is not the best option.
Endoscopic Surgery Through the Nose
When surgery is needed, many growths in this region can be reached through the nose using an endoscopic endonasal approach. The sphenoid sinus sits directly beneath the sella, creating a natural corridor to the pituitary and surrounding skull base without an external incision or brain retraction. Extended versions of the approach can reach selected tumors that grow above or beside the gland.
A smaller number of tumors are better approached through a craniotomy because of where and how they extend. Choosing the safest route is part of the surgical planning rather than a one-size-fits-all decision.
Hormone care runs alongside treatment. Some patients need hormone replacement before treatment because the lesion has already reduced normal pituitary function. After surgery, fluid and electrolyte balance and pituitary function are monitored closely, with longer-term endocrine follow-up based on the diagnosis and treatment received.
The Diagnosis-to-Treatment Pathway
1. Initial evaluation
Symptoms, neurological findings, hormone history, and prior imaging help define the problem.
2. Dedicated imaging
Pituitary MRI characterizes the lesion and its relationship to the optic pathways, pituitary gland, cavernous sinus, and nearby vessels.
3. Hormone testing
Endocrine testing checks for hormone excess and deficiency and may strongly suggest a particular diagnosis.
4. Vision assessment
Formal visual field testing measures peripheral vision when the lesion approaches the optic nerves.
5. Define the diagnosis
Age, imaging features, hormone results, and occasionally tissue distinguish pituitary adenoma, cyst, craniopharyngioma, meningioma, and other conditions.
6. Choose treatment
Observation, medication, endoscopic surgery, craniotomy, or focused radiation is selected based on the diagnosis and its effects.
7. Long-term follow-up
Imaging, hormone testing, and vision monitoring continue as appropriate for the specific condition and treatment.
Frequently Asked Questions
Parasellar means the area immediately around the sella turcica, the bony pocket that contains the pituitary gland. This region includes the optic pathways, cavernous sinuses, carotid arteries, and nearby hypothalamus.
No. Cysts, inflammation, pituitary enlargement related to other medical conditions, and abnormalities of nearby blood vessels can sometimes resemble a tumor on imaging.
Pituitary adenoma, also called a pituitary neuroendocrine tumor or PitNET, is the most common growth in the pituitary and parasellar region.
The optic nerves and optic chiasm sit directly above the pituitary gland. A growth extending upward can compress them and commonly affects peripheral vision first.
No. Some lesions are simply monitored, and some — especially prolactin-producing pituitary tumors — are often treated primarily with medication. Treatment depends on the diagnosis and its effects.
Yes. Many tumors in this region can be reached through an endoscopic endonasal approach through the nostrils. Some tumors are better approached through a craniotomy depending on their location and extension.
Pituitary-region growths can either produce excess hormones or reduce normal pituitary function. Hormone testing helps identify the diagnosis and problems that may need treatment before or after surgery.
Depending on the diagnosis, care may involve skull base neurosurgery and ENT, endocrinology, ophthalmology, neuroradiology, radiation oncology, and other specialists.
Specialists in Pituitary and Parasellar Tumors
Care for tumors and other growths in this region may involve skull base neurosurgery, ENT, endocrinology, ophthalmology, neuroradiology, radiation oncology, and other specialists depending on the diagnosis.
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