[Bladder AA amyloidosis: A rare location. About a case].

INTRODUCTION: Bladder localization of AA amyloidosis is rare. It can be responsible for massive and recurrent hematuria. We report a case of bladder AA amyloidosis secondary to Crohn's disease in a renal transplant patient.

CLINICAL OBSERVATION: A 62-year-old man, suffering from Crohn's disease since 1991 complicated by renal AA amyloidosis. He received a kidney transplant since 20 years from an HLA identical donor. After an 18-year period of clinical remission, the patient was admitted for a flare-up of his Crohn's disease in the form of intermittent diarrhoea. Treatment with corticosteroids allowed a good evolution. A year later, he was rehospitalized for massive macroscopic haematuria. Histological examination of the bladder biopsy revealed AA amyloidosis. The patient fully recovered but died 6 weeks later from septic shock of urinary origin.

CONCLUSION: The treatment of bladder localization of AA amyloidosis is based on treating the cause. Hematuria is sometimes massive, exceptionally requiring emergency cystectomy for haemostasis.