[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Radiology](https://durgical.com/en/radiology/) › [Principles and safety](https://durgical.com/en/radiology/areas/principles/) › Gadolinium and the kidney # Gadolinium and the kidney - Modality MRI contrast is removed by the kidneys. When they fail badly, it lingers and in rare cases causes a disease that hardens the skin. Updated Nov 13, 2026 ## Key points - NSF: skin and organ fibrosis after gadolinium in severe kidney disease, dialysis or acute kidney injury. - Linear agents carry more risk; macrocyclic agents are more stable. - Check eGFR before gadolinium in patients at risk. - Iodinated CT contrast does not cause NSF. - Brain retention of gadolinium occurs even with normal kidneys; its clinical meaning is unknown. ## What it is Gadolinium-based contrast agents are gadolinium ions held in a chelate, a cage-like molecule that keeps the toxic free metal from reaching the tissues; the kidneys clear them. Two groups exist by structure: linear chelates, which hold the ion less tightly, and macrocyclic chelates, which hold it more tightly and release far less. Nephrogenic systemic fibrosis (NSF) is a rare, serious fibrosing disease seen almost only in patients with severe chronic kidney disease, on dialysis or with acute kidney injury who received gadolinium, mostly the less stable linear agents. It was recognised around the year 2000 and linked to gadolinium in 2006. It causes symmetrical thickening and hardening of the skin, usually starting on the legs and spreading up, joint contractures and sometimes fibrosis of internal organs. Since less stable agents were restricted for these patients, kidney function was checked before contrast and macrocyclic agents became the norm, new cases have become very rare. NSF is not caused by the iodinated contrast used in CT. Separately, small amounts of gadolinium are retained in the brain and bone even in people with normal kidneys, more with linear agents; no harm has been proven. ## Key facts - NSF risk groups: eGFR below about 30, dialysis, and acute kidney injury. - Skin: symmetrical, woody, thickened plaques on the limbs, sometimes with a cobblestone or orange-peel surface; the face is usually spared. - Joints: contractures from skin and fascial fibrosis; internal organs (lungs, heart, muscle) can be involved. - Diagnosis: clinical picture plus a deep skin biopsy (thickened collagen, many CD34-positive fibrocytes). - No proven treatment; improving kidney function, including transplantation, can halt or improve it. ## How the image is made - Gadolinium is a paramagnetic metal that shortens T1, making enhancing tissue bright; free gadolinium is toxic, so it is always given chelated. - Linear chelates hold the ion less tightly; macrocyclic chelates hold it in a closed ring and release less. - Normal kidneys clear the agent within about a day; in severe kidney failure it stays much longer, so more gadolinium can be released. - Released gadolinium deposits in tissue and is thought to attract circulating fibrocytes that lay down collagen. ## What it is good for - Contrast-enhanced MRI is still often the best test: tumours, infection, inflammation and vessels. - Its benefit is weighed against risk, and in severe kidney disease alternatives are considered first: MRI without contrast, ultrasound or CT. ## Limitations and risks - Onset can be days to months after exposure, so the link to a scan can be missed. - It looks like scleroderma, but it spares the face and lacks Raynaud phenomenon and the typical autoantibodies. - Disability can be severe, from contractures, and some patients die from organ involvement. - Withholding a needed contrast study also harms: the decision is shared with the radiologist. ## Next step - Before gadolinium in a patient at risk (kidney disease, diabetes, hypertension, older age), check a recent eGFR. - eGFR below about 30, dialysis or acute kidney injury: discuss with the radiologist whether non-contrast MRI or another test will do. - If contrast is essential: a macrocyclic agent at the smallest diagnostic amount, without repeating it soon after. - Patients on haemodialysis: arrange dialysis soon after the scan, as many centres do, though it has not been proven to prevent NSF. - New skin thickening or contractures after gadolinium in kidney failure: refer to dermatology for a deep skin biopsy. ## Test yourself Think of the answer, then tap the question to see it. ## Which patients are at risk of nephrogenic systemic fibrosis after gadolinium? Those with severe chronic kidney disease (eGFR below about 30), those on dialysis and those with acute kidney injury. ## Why are macrocyclic gadolinium agents safer than linear ones? The ring-shaped chelate holds the gadolinium ion more tightly, so less free, toxic gadolinium is released into the tissues. ## How does NSF differ clinically from systemic sclerosis? NSF usually spares the face, lacks Raynaud phenomenon and the typical autoantibodies, and follows gadolinium exposure in kidney failure. ## Does iodinated contrast for CT cause nephrogenic systemic fibrosis? No. NSF is linked to gadolinium-based MRI contrast; iodinated contrast has other risks but not this one. [Add to my cards (4)](https://durgical.app/estudiar/?add=/en/radiology/gadolinium-and-the-kidney/) ## Connections ## Related 4 - [MRI safety: implants, metal and gadolinium](https://durgical.com/en/radiology/mri-safety-implants-metal-and-gadolinium/) - [MRI: T1, T2, FLAIR and diffusion](https://durgical.com/en/radiology/mri-t1-t2-flair-and-diffusion/) - [Iodinated contrast: reactions and the kidney](https://durgical.com/en/radiology/iodinated-contrast-reactions-and-the-kidney/) - [Requesting a study and reading the report](https://durgical.com/en/radiology/requesting-a-study-and-reading-the-report/) ## Related conditions 3 - [Chronic kidney disease](https://durgical.com/en/conditions/chronic-kidney-disease/) - [Acute kidney injury](https://durgical.com/en/conditions/acute-kidney-injury/) - [Systemic sclerosis (scleroderma, including CREST)](https://durgical.com/en/conditions/systemic-sclerosis/) [← All of radiology](https://durgical.com/en/radiology/) Educational content; it does not replace a radiologist's report and is not a clinical instruction. Each study is ordered on the patient's assessment and your institution's protocols. Sources: [Nephrogenic Systemic Fibrosis](https://www.ncbi.nlm.nih.gov/books/NBK567754/) (StatPearls (NCBI Bookshelf), 2024); [Magnetic Resonance Imaging (MRI) Safety and Biological Effects](https://www.ncbi.nlm.nih.gov/books/NBK604477/) (StatPearls (NCBI Bookshelf), 2026). ## **Spotted a mistake?** We are always improving for the community. Tell us what is wrong and our team will review it. Report a mistake Representative model, for educational purposes only. --- Source: https://durgical.com/en/radiology/gadolinium-and-the-kidney/ License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/radiology/gadolinium-and-the-kidney/