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83-year-old man married 50 years nearly stumps doctors with surprise STI

By Eric November 7, 2025

In a fascinating case that underscores the complexities of diagnosing syphilis, an 83-year-old married man in Belgium presented a unique challenge to his healthcare providers. Despite claiming to have been in a monogamous marriage for 50 years and having been sexually inactive in recent years due to cancer treatment, he was diagnosed with a rare form of secondary syphilis. This case highlights the often deceptive nature of the disease, which is known for its ability to present with a variety of symptoms that can easily mislead both patients and doctors.

The clinical team meticulously documented their diagnostic journey in a report published in the New England Journal of Medicine, illustrating the importance of thorough investigation in cases where patient history may not align with clinical findings. Syphilis, often referred to as a “master of disguise,” can manifest in atypical ways, particularly in older patients or those with complex medical histories. The doctors employed a series of tests and evaluations to confirm the diagnosis, ultimately revealing that the man’s condition was indeed secondary syphilis, despite his insistence on a lack of sexual activity. This raises critical questions about the reliability of patient-reported histories and the necessity for healthcare professionals to maintain a high index of suspicion when faced with seemingly contradictory information.

This case serves as a poignant reminder of the importance of comprehensive sexual health education and the need for open communication between patients and healthcare providers. It also emphasizes the rising incidence of syphilis in various demographics, including older adults, which may be overlooked due to assumptions about sexual activity. As syphilis cases continue to rise globally, this incident serves as a crucial learning opportunity for clinicians to remain vigilant and consider all possibilities, regardless of a patient’s reported history.

https://www.youtube.com/watch?v=F946GHgRYSE

Syphilis can be a tricky disease to diagnose—especially when a patient may not be sharing the whole story.

Doctors in Belgium met with a real head-scratcher when an 83-year-old married man came in with a rare form of secondary syphilis—the second of four stages of the sexually transmitted bacterial infection that has been called a “master of disguise.”

The man told doctors up front that he was in a monogamous 50-year-long marriage and had been sexually inactive in recent years following treatment for cancer. In
a Clinical Problem-Solving report
published today in the New England Journal of Medicine, doctors laid out the step-by-step tests and reasoning they used to get to the right diagnosis, which still didn’t answer all their questions.
Read full article

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