[Severe thrombocytopenia after diagnosis of deep venous thrombosis]. / Svær trombocytopeni i efterforløbet af dyb venøs trombose.

A patient presented with erysipelas and developed deep venous thrombosis (DVT) and later idiopatic thrombocytopenic purpura (ITP). In the literature we find no reports of ITP following DVT. It is well known that patients can develop HIT after DVT or DVT after ITP, both caused by the medicine used for treatment. Patients have developed ITP after heparin-induced thrombocytopenia (HIT). Cases are also described in which heparin antibodies are found, but in which the final diagnosis was ITP. The diagnosis of the patient in our case story could be ITP based on DVT, but with no history of HIT. Alternatively, he could have developed two complications to an infection.