Renal myxoma: an unexpected differential diagnosis.

Myxomas are rare mesenchymal tumors that can appear in many anatomical locations, although they are mainly seen in heart and skin. To date, only twelve cases of pure renal myxomas have been reported in the literature. We describe a case of a young Cuban woman with an asymptomatic irregular cyst lesion in her left kidney which was eventually diagnosed as renal myxoma. We also provide radiological and pathological studies.

Localized primary ureteral amyloidosis.

OBJECTIVE: To analyze a new case of primary localized amyloidosis of the ureter, describing the differential diagnosis with ureteral tumors and its pathogenic mechanism. METHOD: Description of the case of a male patient who presented clinical symptoms of renoureteral pain and hematuria and an image suspected of ureteral tumour undergoing laparoscopic nephroureterectomy. The pathological study confirmed amyloidosis of the ureter, AL by immunohistochemistry. RESULTS: This report further extends the slightly more than 50 published cases of primary localized amyloidosis of the ureter the clinical signs of which, pain and haematuria, are similar, showing stenosis and enlargement in an area of the ureteral wall on imaging techniques. In the majority of cases the diagnosis was obtained postoperatively, being necessary to exclude generalized and secondary affectation. CONCLUSIONS: Emphasis must be placed on the differential diagnosis of tumors of the ureter, especially in single-kidney patients, by using ureteroscopy and biopsy or preferably a careful cytological study. In our case a local inflammatory phenomenon could have been the basis of its pathogenesis.

Amiloidosis ureteral primaria localizada / Localized primary ureteral amyloidosis

OBJETIVO: Analizar un nuevo caso de amiloidosis ureteral primaria localizada, ahondando en el diagnóstico diferencial con los tumores ureterales y en su mecanismo patogénico.MÉTODO: Describimos el caso de un paciente varón, al que por clínica de dolor renoureteral y hematuria y sospecha por imagen de tumor ureteral, se practicó nefroureterectomía laparoscópica, confirmando el estudio histológico amiloidosis ureteral, AL por inmunohistoquímica. RESULTADOS: Viene a engrosar los escasos 50 casos publicados de amiloidosis ureteral primaria localizada, cuya manifestación clínica de dolor y hematuria es similar, encontrando estenosis y engrosamiento en una zona de la pared ureteral en técnicas de imagen. En la mayoría el diagnóstico fue postoperatorio, debiendo excluir afectación generalizada y secundaria.CONCLUSIONES: Hay que incidir en el diagnóstico diferencial con los tumores de uréter, sobre todo en pacientes monorrenos, mediante ureteroscopia y biopsia o preferible estudio exhaustivo citológico. En nuestro caso un fenómeno inflamatorio local, pudo ser la base de su patogénesis(AU)

OBJECTIVE: To analyze a new case of primary localized amyloidosis of the ureter, describing the differential diagnosis with ureteral tumors and its pathogenic mechanism.METHOD: Description of the case of a male patient who presented clinical symptoms of renoureteral pain and hematuria and an image suspected of ureteral tumour undergoing laparoscopic nephroureterectomy. The pathological study confirmed amyloidosis of the ureter, AL by immunohistochemistry.RESULTS: This report further extends the slightly more than 50 published cases of primary localized amyloidosis of the ureter the clinical signs of which , pain and haematuria, are similar, showing stenosis and enlargement in an area of the ureteral wall on imaging techniques. In the majority of cases the diagnosis was obtained postoperatively, being necessary to exclude generalized and secondary affectation.CONCLUSIONS: Emphasis must be placed on the differential diagnosis of tumors of the ureter, especially in single-kidney patients, by using ureteroscopy and biopsy or preferably a careful cytological study. In our case a local inflammatory phenomenon could have been the basis of its pathogenesis(AU)