Mr. Antônio (a fictional name), 68, sought medical attention due to persistent tingling in his fingers, especially at night, which had already been waking him several times a week. The complaint is extremely common: carpal tunnel syndrome is one of the conditions most frequently treated in hand surgery, caused by compression of the median nerve at the wrist, and affects more women than men. But in cases like Mr. Antônio’s, older men, the condition may be hiding something beyond mechanical nerve compression.
What We Observed During Surgery
The collected material was sent for histopathological analysis. The first step is staining using the Congo red method, a standard technique for identifying amyloid protein deposits in tissues. The slide is then examined under polarized light, where the characteristic finding appears: apple-green birefringence, confirming the presence of amyloid deposits.
In summary, Congo red staining is the gold standard for identifying amyloid, while apple-green birefringence under polarized light confirms the diagnosis. This result directly guides the patient’s treatment and follow-up.
Amyloidosis is a disease caused by the abnormal accumulation of misfolded proteins in tissues. One of the types most commonly associated with carpal tunnel syndrome involves a protein called transthyretin (TTR), which can accumulate due to an inherited genetic mutation or, in many cases, without any specific mutation, known as the wild-type form. This variant commonly affects the heart and liver over time.
It’s Not Just Carpal Tunnel Syndrome
This is the central point of the case: amyloidosis can affect the heart, kidneys, and liver, which is why numbness or tingling in the hand, especially when associated with bilateral carpal tunnel syndrome in older patients, warrants a more careful evaluation. Sometimes, the hand gives the first warning of a potentially serious disease, and symptoms that appear to involve completely different organs may actually be connected.
Why Age and Timing Matter
One of the most relevant aspects of this type of finding is timing. In many patients, carpal tunnel syndrome appears years before any signs of cardiac involvement. This means that early diagnosis, made while investigating what may seem like a minor complaint in the hand, can provide a valuable window to begin treatment for amyloidosis before it progresses to heart failure or kidney or liver involvement. Early diagnosis can make all the difference in treatment and quality of life.
What This Case Teaches
This case reinforces an important point: not all numbness in the hand is simply a local problem. Carpal tunnel syndrome, although extremely common and treatable, can in some cases be the first visible sign of a silent systemic disease. Recognizing this pattern, especially in men over 60 or 70, can make the difference between an early diagnosis of amyloidosis, with effective treatment, and silent progression until the heart, kidneys, or liver are affected.
— Dr. Rodrigo Berlink and Dr. André Eiras
If you experience tingling or numbness in your hands, or know someone who needs a specialized evaluation, visit riohandexperts.com.br/appointment and schedule an appointment. Our offices are located in different neighborhoods throughout Rio de Janeiro.
