“…Successful retrieval of filters has been reported up to 317 days after insertion 4 . As in the case described by Baschera et al, 1 it is not uncommon to find a clot in the filter at the time of attempted retrieval, for which multiple causes have been proposed 5 . In this situation, it is our practice to rebook patients for a repeat cavogram and second retrieval attempt after therapeutic anticoagulation for 1–2 months.…”