Catastrophic antiphospholipid syndrome: a rare cause of disseminated microvascular thrombotic injury - a case report with pathological and molecular correlative studies.

Catastrophic antiphospholipid syndrome (CAPS) is a severe and rare variant of antiphospholipid syndrome (APS) characterized by acute multiorgan failure due to small vessel thrombi in patients with positive antiphospholipid antibodies. We report a fatal case of catastrophic antiphospholipid syndrome in a young woman with a history of polymyositis and Hodgkin lymphoma. The patient was admitted to hospital because of severe foot pain following several weeks of skin ulcerations. Doppler ultrasonography showed evidence of arterial ischemia of the both lower extremities. Despite anticoagulation, immunosuppression, plasmapheresis and antibiotic therapy, she developed cutaneous gangrene, retroperitoneal hematoma, ileus, and acute respiratory and renal failure that resulted in death. Autopsy showed multifocal vascular injury and microthrombi with associated hemorrhages and infarcts in multiple organs. The patient had normal levels of functional protein C and protein S and a normal level of plasma homocysteine. Tests for common thromophilic gene mutations including prothrombin 20210, factor V Leiden 1691, and methylene tetrahydrofolate reductase 677 were negative. To our knowledge, this is the first CAPS patient with molecular studies for genetic prothrombotic mutations. Our report showed that there was no association between the development of CAPS and inherited thromophilia.