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Adrenal biopsy

Adrenal Mass Biopsy: — What Has to Happen Before the Needle

Most adrenal lumps do not need a biopsy. When one does, there is a mandatory safety step your team must complete first — and skipping it can cause a life-threatening reaction in the procedure room.

Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026

  • Most masses are not biopsied — Imaging and hormone blood tests resolve the majority of adrenal lumps without tissue sampling.
  • One hormone test must come first — Phaeochromocytoma — a tumour that releases adrenaline — must be excluded before any needle goes in.
  • Bleeding risk is real — The adrenal gland has a rich blood supply, so your clotting levels are checked before the procedure.
  • Biopsy confirms what imaging cannot — It is most often used to check whether a cancer from elsewhere has spread to the adrenal gland.
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Most adrenal masses do not need a biopsy. Imaging and hormone blood tests identify the majority of lumps without tissue sampling. When a biopsy is needed, your team must first exclude phaeochromocytoma — a hormone-producing tumour — because biopsying it without preparation can trigger a dangerous rise in blood pressure.

What do these terms on your scan report mean?

Adrenal incidentaloma
A lump found in the adrenal gland by chance on a scan done for a different reason — for example, a CT arranged for back pain. The majority are benign and require monitoring rather than treatment.
Phaeochromocytoma
A tumour of the adrenal gland that produces adrenaline and related hormones. Inserting a needle into it without first blocking those hormones can trigger a sudden, dangerous spike in blood pressure.
Biochemical exclusion
Blood or urine tests that measure adrenaline-related chemicals to check whether your adrenal mass is producing excess hormones. This result must come back before a biopsy is considered.
CT-guided core needle biopsy
A procedure in which a thin needle is directed into the adrenal gland in real time using CT scanning. A small piece of tissue is removed and sent to the laboratory, usually under local anaesthetic with sedation.

Why does a hormone test have to come before an adrenal biopsy?

Phaeochromocytoma stores large amounts of adrenaline. Disturbing the tumour with a needle before that hormone release has been blocked can cause the gland to flood the bloodstream in seconds.

The result is a hypertensive crisis — a sudden, extreme rise in blood pressure that can cause a stroke or a cardiac event in the procedure room. This is why biochemical testing is mandatory before every adrenal biopsy, regardless of how unlikely phaeochromocytoma looks on imaging.

The test is a blood or urine sample checked for catecholamines and metanephrines. Your team will tell you whether any medications need to be paused beforehand. Only when the result comes back within normal limits is it safe to proceed.

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When is an adrenal biopsy actually needed?

CT and MRI can characterise most adrenal masses without tissue sampling. The density, fat content, and washout pattern of a lump on imaging are often enough to confirm a benign adenoma and avoid biopsy entirely.

A biopsy is most commonly needed when a known cancer — such as lung or kidney cancer — may have spread to the adrenal gland and tissue confirmation is required before treatment changes. Your oncologist needs to be certain the adrenal lump is related to the existing cancer, not a coincidental benign finding.

It may also be done when imaging remains genuinely indeterminate after all non-invasive tests are complete. Your team will weigh whether the biopsy result will actually change your management before recommending it. If it will not, the biopsy will not be offered.

Did you know?

Phaeochromocytoma is uncommon among adrenal masses, but the consequences of biopsying one unprepared are severe enough that international guidelines — including those from NCCN and the Endocrine Society — make biochemical exclusion mandatory before any adrenal biopsy, regardless of how the mass appears on imaging.

Source: NCCN Guidelines; Endocrine Society Clinical Practice Guideline on Phaeochromocytoma and Paraganglioma

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Common questions

Frequently asked questions

How do doctors work out what an adrenal mass is without a biopsy?

CT and MRI are the starting point. The density, fat content, and the speed at which a mass washes out contrast dye on CT can reliably identify most benign adrenal adenomas without tissue. Alongside imaging, blood and urine hormone tests check whether the lump is producing excess hormones. Together, these two steps resolve the majority of adrenal masses. Biopsy is reserved for the minority where imaging and biochemical testing leave the diagnosis genuinely uncertain, or where a known cancer elsewhere needs tissue confirmation that it has spread to the adrenal gland.

What is the biochemical test for phaeochromocytoma, and how long does it take?

The test measures adrenaline-related chemicals — catecholamines and their breakdown products called metanephrines — in your blood or urine. Your team will tell you which sample type they need and whether any medication should be paused beforehand, because some common medicines affect the result. Results generally take several days. The test must be completed and confirmed normal before any adrenal biopsy is scheduled. Ask your team for the expected turnaround at your centre.

Can the biopsy itself cause a dangerous reaction if phaeochromocytoma was not excluded?

Yes, and this is exactly why the exclusion step exists. Biopsying a phaeochromocytoma that has not had its hormone release blocked can trigger a hypertensive crisis — a dangerous spike in blood pressure that can cause a stroke or cardiac event. This risk is serious enough that bodies including NCCN and the Endocrine Society treat biochemical exclusion as mandatory, not optional. If your team is proposing an adrenal biopsy and has not mentioned this step, it is reasonable to ask directly whether phaeochromocytoma has been excluded.

What is the bleeding risk with adrenal biopsy?

The adrenal gland has a rich blood supply, so bleeding is the most common complication. Your clotting levels are checked before the procedure, and any blood-thinning medicines — including aspirin and some supplements — will need to be paused for a period your team will specify. Most post-procedure bleeding is minor and settles with observation. Your team will tell you what to watch for after you are discharged and when to call them if you are concerned.

Will I need to stay overnight after an adrenal biopsy?

It depends on where the lump is, the approach the radiologist uses, and how you are after the procedure. Some patients are discharged the same day after a period of observation; others stay overnight to monitor for bleeding or blood pressure changes. If phaeochromocytoma required preparation beforehand, overnight monitoring is more likely. Your team will confirm the plan before your procedure day so you can arrange for someone to be with you and know what to expect.

If the biopsy result is benign, does the mass still need to be followed up?

Usually yes. A benign biopsy result answers the question about tissue type, but does not mean the mass will always stay stable in size or character. Most centres follow adrenal masses with interval imaging for at least a few years, and the frequency depends on the size of the lump and the original imaging findings. Your oncologist or endocrinologist will give you the specific follow-up plan. If follow-up has not been discussed after a benign result, ask directly.

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