These X-rays were taken from a patient who complains of epiphora.

1. What is this investigation?

 
2. What is shown in the above pictures?

 

Answer to Q1
This is a left dacryocystogram (DCG).

Answer to Q2
The DCG shows a patent dacryorhinostomy.
The picture shows dye in the lacrimal sac which flows into the nasal cavity through the DCR.