Put A Lid On It

Question: A 62 year old female undergoes orbital floor repair after a blowout fracture caused by a motor vehicle accident.  A subtarsal incision is employed and a titanium mesh plate is used to support the orbital contents.  Six weeks postoperatively, she notes epiphora.  There was no injury to the nasolacrimal duct at the time of her injury.  What may have caused this, and what could have been done to help prevent it?    [Answer will be posted with next week's new question]

Answer to last week's question, "Anatomy Predicts the Pathology" (October 16, 2017)

Endolymphatic sac tumor.