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If I may, can I clarify your question?
Are you asking whether having the angiogram itself or the Visudyne may have caused blood clots?
And are you also asking what treatment steps you should take in the future assuming this was a result of the angiogram or Visudyne?
Fluorescein angiography can, uncommonly, induce a thrombophlebitis which can cause local swelling, but this is usually limited to the injection site or areas near the injection site. I would not expect an accumulation of fluorescein angiograms to be the culprit for this leg swelling.
Does this answer your question?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must be examined by your doctor.
I do not know of a study which has been done which gives probabilities for such an adverse event; this is likely because it is not a common adverse event and happens in less than 10% of patients. I can certainly keep looking for such a percentage, but as of now, I know of no probability stated in safety trials or reports in the literature, currently.