| We present a 63-year-old patient with a history of hypertension and angina pectoris, referred to our service from a hospital in a rural area. | |
| The reason for consultation was the incidental finding on ultrasound of a left renal mass, without any symptoms. | |
| Blood tests revealed only a mild stenosis. | |
| Located foot studies 10 were performed in which a mass effect was observed at the left flank level, with smooth and well-defined edge, dependent on the upper pole of the left kidney, with compression of the urethra x system. | |
| The CT scan revealed a 17 x 12 x 19 cm mass in the upper pole of the left kidney, with cystic areas, compatible with multilocular cystic nephroma, without lymphadenopathy. | |
| DMSA scintigraphy showed differential renal function of 63% for the right kidney and 37% for the left kidney. | |
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| A new ultrasound showed an image compatible with a large hydatid cyst with structures compatible with vesicles inside. | |
| The hydatid serology was negative, so it was decided to submit the patient to a NMR that did not clarify the diagnosis definitively: mass in the upper pole of the left kidney with hydatid cyst and complex internal structure renal cyst. | |
| In view of the above results, the next step was the ultrasound guided puncture of the renal mass, being again negative serology for hydatid disease, although a fluid of crystalline aspect was obtained. | |
| Finally, the patient underwent surgical intervention in which the diagnosis of renal hydatid cyst was confirmed and partial cystectomy was performed, preparing the operating field with diapers bathed. | |
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| Postoperative evolution was favorable and treatment with albendazole 400 mg every 12 hours for one month after surgery was instituted. | |
| At present, the patient remains asymptomatic (the arterial hypertension that was already present before the diagnosis is maintained) and the serology of control remains negative, with minimal recurrence. | |