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Presentation type	Oral presentation
Title	Peripapillary intrachoroidal cavitation and deep structures at peripapillary poles

Purpose	To compare deep structures at peripapillary poles when a peripapillary intrachoroidal cavitation (PC) coexists with tilted disc (TD) and peripapillary staphyloma (PS) versus when only TD and PS coexist.
Methods	It’s a cross-sectional observational study. Radial and linear scans centered on the optic nerve head are performed with OCT. Eyes are classified according to the presence of TD, PS and PC. The posterior choroidal wall is analyzed from the peripapillary area to the Bruch’s membrane opening. Three choroidal configurations are analyzed on the γ-zone side: regular convexity, loss of convexity and triangular deformation. Discontinuity of the border tissue below Bruch's membrane (BT) and suprachoroidal detachment are also looked for.
Results	334 patients are enrolled. Choroidal triangular deformation is observed in 86,1% of eyes with PC, in 21,4% of eyes combining PS and TD without PC and in 4,7% of eyes affected either by PS or by TD. This configuration is statistically more frequent in eyes with PC as compared to those combining PS and TD without PC (Chi2 test, p<0,01). Suprachoroidal detachment and BT discontinuity are only seen in eyes with PC (Fisher's test, p<0,001).
Conclusion	The statistical correlation between PC and the choroidal triangular deformation on the one hand and BT discontinuity on the other hand, suggests the role of mechanical factors in the etiology of PC. The progressive choroidal deformation, from regular convexity to triangular configuration, is rarely seen without the PS-TD combination. It suggests that stresses causing these deformations are applied when TD and PS coexist. Suprachoroidal detachment, only seen in case of PC, could be a diagnostic criterion for PC.
Conflict of interest	No

Authors 1

Last name	BACQ
Initials	N
Department	Hôpital Erasme
City	Brussels

Authors 2

Last name	DUGAUGUIER
Initials	A
Department	Hôpital Erasme
City	Brussels

Authors 3

Last name	KISMA
Initials	N
Department	Hôpital Erasme
City	Brussels

Authors 4

Last name	ALAOUI
Initials	Y
Department	Hôpital Erasme
City	Brussels

Authors 5

Last name	COPPENS
Initials	K
Department	Hôpital Erasme
City	Brussels

Authors 6

Last name	LEROY
Initials	K
Department	Laboratoire de neuro-anatomie, ULB
City	Brussels

Authors 7

Last name	BREMER
Initials	F
Department	Hôpital Erasme
City	Brussels

Authors 8

Last name	EHONGO
Initials	A
Department	Hôpital Erasme
City	Brussels