Pyonephrosis as a sign of sarcomatoid carcinoma of the renal pelvis

摘要

We report the case of an urgent nephrectomy because of a pyonephrosis and sepsis due to an unsuspected sarcomatoid transitional cell carcinoma,an infrequent subtype with a bad oncological prognosis.we present a 58-year-old man assessed by internal medicine for a general syndrome and weakness many months previously.A pyonephrotic kidney was observed at abdominal computed tomography in the context of septic shock,without suspecting the underlying cause.The pathology report described a sarcomatoid transitional cell carcinoma.sarcomatoid transitional cell carcinoma is an invasive and infrequent subtype of urothelial tumors.The symptoms are often the same as other renal masses;however,in this case,sepsis and pyonephrosis were the rare initial symptoms.