Infected simple renal cyst. Case report

To present a new case of an infected simple renal cyst, its diagnosis and the treatment carried out.

30 year-old female patient admitted to the Internal Medicine ward suffering a prolonged fever syndrome. On physical examination she presented tachycardia and pain in the left hypochondrium on deep palpation. Abdominal ultrasound revealed the existence of a great size left renal cyst with a highly echogenic content; this liquid hyperdensity was confirmed by simple and i.v. contrast CT scan.

Cyst punction was performed through a lumbar via, getting approximately 400 millilitres of a clear and odourless yellow liquid; then it was sclerosed with ethanol. The microbiological study of the extracted liquid was negative. The patient's clinical evolution has been satisfactory and renal ultrasound controls were normal.

Faced with a simple infected renal cyst whose location allows percutaneous lumbar approach, punction with synchronic sclerosis plus parenteral antibiotic therapy with ciprofloxacin is the recommended treatment.