Frequently Asked Questions About Ommaya Reservoirs and Ommaya Taps

This information answers some commonly asked questions about Ommaya reservoirs and Ommaya taps.

Back to top

About Ommaya Reservoirs

What is an Ommaya reservoir?

An Ommaya reservoir is a quarter-sized, soft, plastic, dome-shaped device that is placed under your scalp. It’s connected to a catheter (thin, flexible tube) that’s placed in one of the ventricles in your brain (see Figures 1 and 2). Your ventricles are hollow spaces that make cerebrospinal fluid (CSF), which surrounds your brain and spinal cord.

Figure 1. Ommaya reservoir

Figure 1. Ommaya reservoir

Figure 2. Placement of the Ommaya reservoir

Figure 2. Placement of the Ommaya reservoir

Why do I need an Ommaya reservoir?

An Ommaya reservoir will help your healthcare provider:

  • Get samples of your CSF. Your healthcare provider can check your CSF for cancer cells or infections.
  • Give you medication, such as chemotherapy, monoclonal antibodies, or antibiotics, directly into your CSF.

These procedures are referred to as an “Ommaya reservoir tap.” You may need fewer spinal taps if you have an Ommaya reservoir.

How is an Ommaya reservoir placed?

Your Ommaya reservoir will be placed during a surgery. Your doctor or nurse will explain the details of your surgery. Your nurse will help you get ready and will give you a resource called Getting Ready for Surgery. You can also search for the resource at

Can the Ommaya reservoir be removed?

The reservoir usually isn’t removed unless you have problems with it.

Are there restrictions on my activities with an Ommaya reservoir?

For at least 6 weeks after your Ommaya reservoir placement surgery, don’t play any contact sports (such as football, boxing, or wrestling). This gives your incision (surgical cut) time to heal.

Talk with your neurosurgeon about when you can play contact sports again. Remember to wear a helmet, if needed. This reduces your risk of getting a head injury.

How do I care for my Ommaya reservoir?

Your Ommaya reservoir doesn’t need special care. You can wash your hair as usual.


Back to top

About Ommaya Reservoir Taps

Do I need to do anything to get ready for my Ommaya reservoir tap?

Tell your healthcare provider if you’re allergic to iodine (Betadine®). They will use a different solution.

You don’t need to do anything else to get ready for your tap. You can eat your meals and take your medications as usual.

What happens during the tap?

Your healthcare provider will do the procedure in an exam room or at your bedside.

Figure 3. During an Ommaya tap

Figure 3. During an Ommaya tap

  1. Your healthcare provider will gently feel the Ommaya reservoir. They will push down on it several times to pump it. This pulls the CSF into the reservoir.
  2. You may be asked to lie on your back. Your healthcare provider will clean your skin with Betadine or with a different solution if you’re allergic to Betadine.
  3. They will then place a small needle with tubing attached to it into your Ommaya reservoir (see Figure 3). You might feel slight discomfort from the needlestick. Your healthcare provider will take out a small amount of CSF through a syringe that’s attached to the tubing. The CSF may be sent to the lab to check for cancer cells or infection. If you’re also getting medication during the tap, some of the CSF may be saved in the syringe to be used as a “flush” (see step 4).
  4. If you’re getting medication during the tap, your healthcare provider will inject it slowly into your reservoir, after taking out the CSF. They will then flush your Ommaya reservoir with the saved CSF to push the medication into your ventricles.
  5. Your healthcare provider will remove the needle and apply gentle pressure with gauze for about 1 minute to prevent any CSF from leaking out. The area may then be covered with a bandage (Band-Aid®).

How long does the tap take?

The tap usually takes about 15 minutes.

When can I go back to my normal activities?

You can go back to all your normal activities after your tap, including washing your hair. Your Ommaya reservoir won’t need any special care.

Back to top

Call Your Healthcare Provider if You Have:

  • A fever of 100.4º F (38ºC) or higher
  • Tenderness, redness, or swelling around your reservoir
  • Clear, bloody, or pus-like discharge from your reservoir
  • Headaches
  • Vomiting (throwing up)
  • Neck stiffness
  • Blurry vision
  • Confusion
Back to top

Tell us what you think

Tell us what you think

Your feedback will help us improve the information we provide to patients and caregivers. We read every comment, but we're not able to respond. If you have questions about your care, contact your healthcare provider.

Questions Yes Somewhat No

Last Updated