Nikhil Prasad Fact checked by:Thailand Medical News Team Jul 26, 2026 56 minutes ago
Medical News: A new medical case is raising serious concerns about how COVID-19 can trigger unexpected and severe complications—even in patients who initially experience only mild symptoms.
Mild COVID-19 infection linked to rare kidney disease that resembles lupus but can be successfully treated if caught early
Mild COVID-19 Case Turns into Medical Emergency
Doctors from the Department of Medicine and Division of Nephrology at UMASS Chan Medical School–Baystate Medical Center in Springfield, Massachusetts, USA have documented a rare and alarming case involving a 74-year-old man whose health rapidly declined after contracting COVID-19.
Although his initial infection was mild, his condition quickly worsened. Within days, he developed severe kidney problems. Tests revealed extremely high protein levels in his urine—around 14 grams per day—an indicator of serious kidney damage.
A Rare Condition with Unusual Features
Further testing revealed that the patient had fibrillary glomerulonephritis (FGN), a rare disease where abnormal protein fibers build up inside the kidneys, damaging their ability to filter blood.
However, this case stood out for several unusual reasons. Typically, FGN is identified by a specific protein marker called DNAJB9, which is present in nearly all known cases. In this patient, that marker was completely absent, making the diagnosis highly unusual and rare.
Even more striking, the immune activity seen in the kidney closely resembled what doctors usually observe in lupus-related kidney disease. Despite this, all tests for lupus were negative, confirming that the patient did not have the condition.
Rapid Kidney Failure and Dialysis
The patient’s kidney function deteriorated rapidly. His creatinine levels rose sharply to 9.9 mg/dL, indicating severe kidney failure. As his condition worsened, doctors had to start dialysis to support his body.
Extensive testing ruled out other causes such as autoimmune disorders, chronic infections, and blood-related diseases. With no other explanation found, doctors believe the recent COVID-19 infection likely triggered the condition.
Treatment Leads to Full Recovery
Doctors initiated aggressive treatment using cyclophosphamide, a powerful drug that suppresses the immune system, along with steroids to reduce inflammation.
This
Medical News report highlights a remarkable outcome. The patient responded well to treatment, his kidney function gradually improved, and dialysis was eventually discontinued. After 18 months, his kidney function returned to normal, and protein levels in his urine completely resolved.
Why This Case Matters
This case is important because it expands the known range of kidney complications linked to COVID-19. While the virus has already be
en associated with several kidney-related conditions, this is the first documented instance of this rare type of fibrillary kidney disease occurring after infection.
Researchers believe that COVID-19 may trigger abnormal immune responses rather than directly damaging the kidneys. This can lead to inflammation and unusual protein deposits that disrupt normal kidney function.
A Warning for Clinicians
The findings suggest that COVID-19 can mimic serious autoimmune diseases like lupus, making diagnosis more complex. This could lead to delays in identifying the correct condition and starting the right treatment.
Additionally, cases without the DNAJB9 marker are extremely rare and are typically linked to other underlying conditions such as chronic infections or cancer. The absence of these factors in this patient strengthens the link to COVID-19 as the likely cause.
Conclusion
This rare case demonstrates that COVID-19 can trigger severe and complex immune-related kidney disease even after a mild infection, highlighting the virus’s unpredictable effects on the body. The findings emphasize the need for careful monitoring of patients after infection and suggest that early, aggressive treatment can lead to full recovery, even in life-threatening situations, offering important hope for future cases.
The study findings were published in the peer reviewed journal: Kidney Medicine.
https://www.sciencedirect.com/science/article/pii/S259005952600244X
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Read Also:
https://www.thailandmedical.news/articles/coronavirus
https://www.thailandmedical.news/articles/nephrology-(kidneys)
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