# Tension Subdural Hygroma Following Resection of Posterior Fossa Tumour in a Child: A new clinico-radio-pathological entity

## TL;DR

A 14-month-old child developed a rare tense subdural hygroma after posterior fossa tumor surgery, requiring specialized treatment.

## Contribution

The paper introduces a new clinico-radio-pathological entity of tense subdural hygroma following posterior fossa tumor resection in children.

## Key findings

- Tense subdural hygroma occurred in a child with stable hydrocephalus after posterior fossa tumor resection.
- The condition has distinct clinical, radiological, and pathological features different from external hydrocephalus.
- Cerebrospinal fluid diversion via shunts was effective in managing the condition.

## Abstract

Persistent hydrocephalus is common in children after resection of posterior fossa tumours. However, occurrence of subdural hygroma is very rare. We report the case of a 14-month-old child who presented at a paediatric neurology clinic in Muscat, Oman in 2021 who developed a tense subdural hygroma with stable hydrocephalus, in the early postoperative period, following posterior fossa tumour resection. We describe the distinctive clinical, radiological and pathological features associated with the development of a tense subdural hygroma. We also discuss the management by cerebrospinal fluid diversion, which includes either a ventriculoperitoneal or subduroperitoneal shunt. This unique condition is distinguished from external hydrocephalus by features that are critical to the management strategy.