A 35 year old woman presents with epiphora and a bony mass around the naso-lacrimal duct. The bony lesion had a classical X-ray appearance.
At DCR, the bony lesion was debulked and sent for histology.
Figures are H and Es.
What is the diagnosis?
Irregular woven bone, without osteoblastic rimming within a spindle cell stroma. No cellular atypia or mitotic activity was identified. The spindle cell stroma appears to dissect the woven bone.
This is fibrous dysplasia affecting the lacrimal sac fossa. In this case it was monostotic.
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Monostotic fibrous dysplasia of the orbit: an unusual lacrimal fossa mass.
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