This is a new portmanteau guideline designed to deal with a number of rarer thrombotic problems not dealt with in other guidelines but not meriting a guideline of their own. The thrombosis dealt with are: Cerebral sinus thrombosis, retinal vein thrombosis, upper extremity thrombosis, vena caval thrombosis, abdominal (splanchnic) vein thrombosis, genito-urinary thrombosis and superficial vein thrombosis. For each type the epidemiology, diagnosis and management are discussed.

The guideline has been reviewed and an addendum has been written on 25 March 2022.

Declaration of Interests

The BSH paid the expenses incurred during the writing of this guidance. None of the authors had conflicts of interest to declare. All authors have made a declaration of interests to the BSH and Task Force Chairs which may be viewed on request.