What is a Rathke cleft cyst?

A Rathke cleft cyst (RCC) is a noncancer (benign) fluid-filled growth that develops between the parts of the pituitary gland at the base of the brain. It’s a congenital deformity. This means that it develops while a baby is growing in the uterus. An RCC develops from a remnant piece of the baby’s growing Rathke pouch, which becomes part of the pituitary gland.

An RCC is rare. And it rarely causes symptoms or problems during childhood, so it’s not usually diagnosed in kids unless symptoms have developed. An RCC is most often found in adults during a magnetic resonance imaging (MRI) scan to diagnose another problem. It can also be found even after death, if an autopsy is done. Women are more likely to develop this condition than men.

If an RCC becomes large enough, it can cause vision changes or problems with hormones due to pressing on the pituitary gland.

What causes a Rathke cleft cyst?

An RCC is thought to occur very early in the fetal development when the inside of the Rathke pouch does not go away as it normally does. This leaves a space that can fill with fluid and grow over time. There are no known outside causes of an RCC.

What are the symptoms of a Rathke cleft cyst?

An RCC grows in a small space at the base of the brain. It can press on the nerves leading from the eyes to the brain, which can cause vision changes. The most common symptoms include:

• Vision changes
• Frequent headaches
• Nausea
• Feelings of drowsiness or fatigue
• Changes in personality or behavior, including confusion

The cyst can also press on the pituitary gland, which can affect the levels of hormones secreted by this gland. This can cause symptoms at different stages of life, such as:

• Lack of growth or late puberty in children
• Irregular or absent menstruation
• Production and leaking of milk from the breasts that is not related to pregnancy or childbirth
• Low blood pressure
• Digestive issues, such as constipation
• Low or no libido
• Feelings of extreme thirst and constant urination
• Obesity
• Unusually dry skin
• Difficulty regulating body temperature

How is a Rathke cleft cyst diagnosed?

An RCC is typically diagnosed with an MRI or CT scan imaging of the brain. An RCC may sometimes first be misdiagnosed as a pituitary gland tumor.

Blood tests to check hormone levels and exams to check vision might also be done.

How is a Rathke cleft cyst treated?

The treatment of an RCC depends on the symptoms. A small RCC that doesn’t cause any symptoms doesn’t need treatment. A larger RCC that is causing symptoms may need surgery. This could include draining and removal of the cyst.

What are possible complications of a Rathke cleft cyst?

Without treatment, an RCC can continue to cause problems with pituitary gland function and issues with weight, hormones, and vision. Proper diagnosis and treatment can relieve symptoms and restore healthy pituitary function.

Key points about a Rathke cleft cyst

• A Rathke cleft cyst (RCC) is a noncancer fluid-filled growth. It develops between the parts of the pituitary gland at the base of the brain.
• It’s a congenital deformity. This means that it develops while a baby is growing in the uterus.
• Although it’s not cancer, an RCC can be mistaken for a tumor.
• A small RCC that doesn’t cause any symptoms doesn’t need treatment.
• An RCC needs treatment (usually surgery) if it interferes with vision or with the normal function of the pituitary gland.