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Title	Suspected optic disc oedema in children – how helpful is ultrasound optic nerve sheath diameter measurement?
Abstract Nr.	P130

Purpose	To determine the role of Optic Nerve Sheath Diameter (ONSD) measurement by Ultrasound (US) in the context of possible raised intracranial pressure (ICP) in children.
Methods	Retrospective case series review in a large university medical center in the Netherlands. A large US-ONSD database was manually searched for cases (age range 0-16yrs) in which the aspect of the optic disc raised suspicion of oedema and for whom an US-ONSD measurement was requested. Paediatric case notes were scrutinized for relevant, and esp. missed, diagnoses with concomitant raised ICP after the ONSD measurements.
Results	Out of 93 cases 46 had an ONSD of 5 mm or more. 9 of these had syndromes with raised ICP. Out of the remaining patients with an ONSD of less than 5 mm 1 was diagnosed with raised ICP. The negative predictive value for raised ICP with an ONSD of less than 5 mm or less was 98%.
Conclusion	US-ONSD measurement appears a useful tool to rule out, rather than confirm, raised ICP in children with suspected optic disc oedema.

Authors 1

Last name	HOUTMAN
Initials	AC
Department	UZ Vrije Universiteit
City	Brussel

Authors 2

Last name	JAPING
Initials	WJ
Department	UMC Groningen
City	Groningen