Hereditary hemorrhagic telangiectasia in a patient with microscopic polyangiitis.

A 55-year-old Japanese woman with microscopic polyangiitis suffered repeated disturbance of consciousness and gastrointestinal bleeding. These problems were initially attributed to microscopic polyangiitis, but hereditary hemorrhagic telangiectasia was finally identified by further workup. Both microscopic polyangiitis and hereditary hemorrhagic telangiectasia are blood vessel-related diseases inducing similar symptoms. To our knowledge, this is the first observation of microscopic polyangiitis and hereditary hemorrhagic telangiectasia in the same patient. From a literature review of the clinical and pathologic manifestations of these diseases, a positive association may exist between the two diseases.