Rare brain condition discovered

In July 2007, neurologist Lionel Feuillet at the Timone hospital in Marseille discovered an extreme case of cerebral plasticity. A 44-year-old civil servant consulted for a simple weakness in his left leg. Scans showed a skull almost entirely filled with cerebrospinal fluid, leaving only a thin layer of neural matter against the wall. This finding challenged the idea that a normal volume of brain tissue is essential for daily life.

Ordinary life with a rare condition

At 44 years old, this man led an ordinary life. He worked in the public sector, raised his two children, and managed his daily life without difficulty. His only reason for consultation remained this persistent weakness in his left leg, while the rest of his health showed no abnormalities.

Medical findings surprise experts

The results of the scan and MRI astonished the medical team. The lateral ventricles occupied almost the entire cranial cavity, so much so that the brain reduced to a thin film. The fluid had invaded all the lobes on both sides, frontal, parietal, temporal, and occipital. According to a study published in The Lancet, neuropsychological tests measured an IQ of 75, with a verbal IQ of 84 and a performance IQ of 70. A score below average, but which did not prevent him from leading a normal life.

Early diagnosis of hydrocephalus

As early as six months of age, doctors had diagnosed this patient with postnatal hydrocephalus. Cerebrospinal fluid accumulated in the brain, causing the condition. Despite the severity of the condition, the man had developed compensatory mechanisms that allowed him to function normally, challenging previous assumptions about the necessity of substantial brain tissue for daily living.