[Syringohydromyelia--coexistence or complication following removal of meningioma of forth ventricle].

Numerous theories have been presented to explain the pathogenesis of syringohydromyelia. Among these is Gardner's hydrodynamic theory with later modifications. Syrinx is usually located in cervical cord and is often associated with Arnold-Chiari, Dandy-Walker malformation or other anomalies of cranio-cervical region. Other theories suggest that syringohydromyelia may be secondary to arachnoiditis, neoplasms or spinal cord trauma. The distal location of the syrinx is very often associated with occult spinal dysraphic lesion. The authors present the case of 28 years old woman operated on meningioma of fourth ventricle. One and a half year later syrinx on Th11-Th12 and coexistent arachnoiditis were recognized. They stress diagnostic and therapeutic difficulties in this case and try to explain of etiology of syringohydromyelia.