CD68

Xanthogranulomatous Pyelonephritis

CD68 staining in xanthogranulomatous pyelonephritis

Xanthogranulomatous pyelonephritis is a rare, severe, chronic inflammatory disorder of the kidney characterized by the destruction of renal parenchyma and its replacement with granulomatous tissue containing lipid-laden macrophages, also known as xanthoma cells. This condition is often associated with urinary tract infections and obstructive uropathy.

Pathophysiology

The pathogenesis of xanthogranulomatous pyelonephritis is not completely understood, but it is believed to involve chronic infection and obstruction. The obstruction, often due to kidney stones or hydronephrosis, leads to impaired drainage and stasis of urine, creating an environment conducive to infection. The chronic infection results in an inflammatory response, with the recruitment of macrophages that ingest lipids, forming the characteristic xanthoma cells.

Clinical Presentation

Patients with xanthogranulomatous pyelonephritis typically present with symptoms of chronic kidney infection, such as fever, flank pain, and malaise. There may also be a palpable mass in the flank region. Laboratory findings often include leukocytosis and elevated inflammatory markers. Urinalysis may show pyuria and bacteriuria.

Diagnosis

The diagnosis of xanthogranulomatous pyelonephritis is often made through imaging studies such as ultrasound, CT scan, or MRI, which reveal an enlarged kidney with multiple low-density areas. A definitive diagnosis is made through histopathological examination, which shows the presence of xanthoma cells and granulomatous inflammation.

Treatment

The primary treatment for xanthogranulomatous pyelonephritis is surgical, often requiring a nephrectomy to remove the affected kidney. Antibiotic therapy is also used to treat any underlying infection. In some cases, partial nephrectomy or drainage procedures may be considered if the condition is caught early and the kidney function can be preserved.

Prognosis

The prognosis for patients with xanthogranulomatous pyelonephritis is generally good following surgical intervention, although the condition can lead to significant morbidity if not treated promptly. Early diagnosis and management are crucial to prevent complications such as sepsis or chronic kidney disease.

Related Pages

• Pyelonephritis
• Kidney stone
• Urinary tract infection
• Nephrectomy