What is leptomeninges fibrosing? Leptomeningitis is an inflammatory disease of the membranes that line the spinal cord and brain. It has several subspecies. One of them is fibrosing. This form develops if a person’s infection has not been treated for a long time or the correct diagnosis has been made. The brain is washed by cerebrospinal fluid or cerebrospinal fluid. Fibrous cystitis, in other words fibrous necrosis, is an irreversible process that leads to damage to the organs of the genitourinary system. The pathology has a second name - interstitial cystitis. It is quite rare, but has great destructive power. The disease is detected mainly in women. According to statistics, this is about 2/3 of all