Overview
Pyonephrosis is a severe condition characterized by suppurative infection within the renal pelvis and calyces, often secondary to urinary obstruction, typically by stones, leading to abscess formation and potential systemic complications 136.Diagnosis
Key Diagnostic Criteria: Presence of fever, flank pain, palpable mass, and signs of systemic infection 13.
Recommended Tests:
- Abdominal radiographs may show fragmented staghorn calculi as a suggestive sign 1.
- Ultrasound or CT scan to visualize abscess formation, hydronephrosis, and calculi 13.
- Urinalysis often reveals pyuria and bacteriuria 36.
Grading: Not explicitly detailed in abstracts, but severity often correlates with imaging findings and clinical presentation 13.Management
First-Line Treatments:
- Surgical Intervention: Nephrectomy is commonly performed, especially in severe cases (62% of cases) 4.
- Drainage Procedures: Nephrostomy or other drainage methods used in cases where conservative surgery is considered 4.
Adjunctive Treatments:
- Antibiotics: Long-term antibiotic therapy, though efficacy varies; specific drug classes and doses not detailed 6.
- Stone Removal: Obstructing stones may need removal to alleviate obstruction 4.Special Populations
Comorbidities: Septic thrombosis of renal vein and vena cava can complicate management, mimicking renal carcinoma 3.
Postoperative Considerations: Benign cholestatic jaundice may occur post-nephrectomy in patients with pyonephrosis and sepsis 5.Key Recommendations
Surgical intervention, particularly nephrectomy, is often necessary for severe pyonephrosis (Evidence: Strong 4).
Imaging, including abdominal radiographs and CT scans, should guide diagnosis and management (Evidence: Moderate 13).
Consider nephrostomy or other drainage procedures when conservative surgery is feasible (Evidence: Moderate 4).
Long-term antibiotic therapy may be required but efficacy varies; individualized treatment based on culture results is advised (Evidence: Weak 6).
Monitor for postoperative complications such as cholestatic jaundice in patients undergoing nephrectomy for pyonephrosis (Evidence: Expert opinion 5).References
1 Penter G, Arkell DG. The fragmented staghorn calculus: a radiological sign of pyonephrosis. Clinical radiology 1989. link80027-3)
2 Mooreville M, Elkouss GC, Schuster A, Pearce AE, Rosen J. Spontaneous renocolic fistula secondary to calculous pyonephrosis. Urology 1988. link90042-8)
3 Eijsten A, Leisinger HJ, Jucker A. Unilateral pyonephrosis with septic thrombosis of the renal vein and vena cava. Urologia internationalis 1986. link
4 Harrison GS. The management of pyonephrosis. Annals of the Royal College of Surgeons of England 1983. link
5 Mukamel E, Douer D, Pinkhas J, Servadio C. Benign cholestatic jaundice after nephrectomy for pyonephrosis and sepsis. The Journal of urology 1979. link56842-1)
6 Altmann G, Melzer M. Pyonephrosis due to salmonella cholerae-suis variant kunzendorf. Infection 1975. link