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Ethmoidal sinus mucocele: an unusual cause of acquired Brown syndrome
  1. R Bhola,
  2. A L Rosenbaum
  1. Jules Stein Eye Institute, University of California Los Angeles, CA, USA
  1. Correspondence to: Arthur L Rosenbaum MD, Jules Stein Eye Institute, 100 Stein Plaza, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-7002, USA; rosenbaumjsei.ucla.edu

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Brown syndrome was first characterised in 1950 by Harold Whaley Brown as a restrictive limitation to elevation in adduction.1 On the basis of surgical findings Brown implicated a shortened superior oblique (SO) tendon sheath as the cause of this syndrome. Most subsequent reports have alternatively proposed an abnormality in the trochlear-SO tendon complex as the cause of restriction to elevation in adduction. Although various causes of acquired Brown syndrome have been described, its association with ethmoidal mucocele is very rare.

Case report

A 38 year old man noted sudden onset of binocular vertical diplopia …

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