How do you determine duration of anticoagulation for an ovarian vein thrombosis following a provoking event?

This specific question has not been addressed in a clinical trial to my knowledge. If the patient is symptomatic, I would anticoagulate for 3 months in the absence of a contraindication, just as I would for most other provoked VTE events. One might consider a watch and wait approach without anticoagulation in an asymptomatic patient, but the evidence to support this approach is limited. (Plastini et al., PMID 29296754).