Tension Subdural Hygroma following Resection of Posterior Fossa Tumor in a Child – A new Clinical Pathological Radiological entity

Subdural hygroma following posterior fossa tumor resection is very rare, with only three cases reported in the literature. Authors describe a case of subdural hygroma following posterior fossa tumor resection with distinct clinical, pathological and radiological features, through an illustrative case of a child, who underwent gross total resection of a fourth ventricular tumor. The clinical, radiological and pathological sequelae following development of post-operative bilaterally symmetrical subdural cerebrospinal fluid collection, under high pressure, explained. The term “tension sudural hygroma” introduced to describe this unique condition, not described elsewhere, to date. Features that differentiate this condition from previously reported cases of subdural hygroma following posterior fossa tumor resection, explained. Subduro-peritoneal shunt as the choice of treatment, rather than ventriculo-peritoneal shunt, burr hole drainage of the subdural hygroma or aspiration of the pseudomeningocele, suggested.