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This abstract is assigned to session BSA - Belgian Strabismological Association

Title

Selected cases of strabismus consecutive to iatrogenic events

Purpose	The purpose of this presentation is to report selected various causes of acquired Brown syndrome secondary to iatrogenic events.
Methods	Limited elevation in adduction, an invariable sign, is the hallmark of Brown syndrome. It is the difference between elevation in adduction versus elevation in abduction that differentiates Brown syndrome from such disorders as double elevator palsy (where elevation is equal to or worse in abduction). If the vertical deviation in primary position is greater than 10-12 PD, an inferior oblique palsy, severe periocular scarring, or a superior nasal mass should be considered.
Results	Peritrochlear scarring and adhesions may occur after orbital trauma, after ocular surgeries as retinal detachment, glaucoma implant or orbital neoplasm excision. Strabismus surgery may by itself cause iatrogenic Brown syndrome after superior oblique tuck (short tendon) or inferior oblique recession procedure (Inferior temporal adhesions).
Conclusion	The peritrochlear region is characterized by a superior oblique "tendon muscle complex" which is very sensible to external events that may reduce telescoping elongation of the superior oblique tendon. It may be secondary to one of the followings: vascular dilatation of the tendon sheath vessels and local edema occurring within the confined area of the trochlea. All invasive events around this area are potential causes of acquired iatrogenic Brown syndrome.

Author 1

Last name	YUKSEL
Initials	D
Department	Cliniques Universitaires Saint-Luc, UCL
City	Brussels