[Secondary bladder amyloidosis. A rare cause of hematuria].

Secondary vesical amyloidosis is an uncommon pathology and few cases are described in the literature. A suddenly appearing hematuria resistant to treatment in a patient with a diagnosis of systemic amyloidosis is usually the initial sign that guides us to its diagnosis. We present a case of vesical amyloidosis in a patient with systemic amyloidosis secondary to a Rheumatoid Arthritis of length evolution, and which was diagnosed as a result of a pattern of massive incoercible hematuria.