Primary lymphomas of the lacrimal sac (PLLS) are rare, but are a genuine cause of secondary acquired nasolacrimal duct obstruction. The aim of the article on PLLS by Sjo et al in this issue of the BJO (p 1004) was to define their clinical and histo-pathological characteristics. Their report on 15 cases of PLLS studied more than seven times the number of cases than the next largest publications defining this subject.
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