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Related Experiment Videos

Metanephric adenoma treated with laparoscopic nephrectomy.

Takashi Ebine1, Rei Ohara, Tetsuo Momma

  • 1Department of Urology, National Tokyo Medical Center, Tokyo, Japan.

International Journal of Urology : Official Journal of the Japanese Urological Association
|March 19, 2004
PubMed
Summary

A rare benign kidney tumor, metanephric adenoma, was incidentally found in a 31-year-old female. Surgical removal confirmed the diagnosis, highlighting the importance of imaging in detecting renal masses.

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Area of Science:

  • Nephrology
  • Oncology
  • Pathology

Background:

  • Incidental detection of renal masses is increasingly common due to advances in medical imaging.
  • Renal tumors encompass a wide spectrum of benign and malignant entities, necessitating accurate diagnosis.
  • Metanephric adenoma is a rare, benign renal neoplasm often presenting as an incidental finding.

Observation:

  • A 31-year-old female presented with an incidentally discovered left renal mass.
  • Imaging studies (CT, angiography) revealed a 4.5 cm hypovascular solid tumor in the left kidney.
  • Macroscopic examination showed an encapsulated tumor with a grayish-yellow cut surface.

Findings:

  • Histological analysis revealed small tumor cells with scant cytoplasm and round, regular nuclei.

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  • Tumor cells formed distinct glomerular-like structures.
  • Absence of mitosis and cellular atypia supported a benign diagnosis, specifically metanephric adenoma.

    • Implications:

    • This case underscores the importance of comprehensive histopathological evaluation for accurate renal tumor diagnosis.
    • Metanephric adenoma, though rare, should be considered in the differential diagnosis of incidentally detected renal masses.
    • Successful surgical management (laparoscopic nephrectomy) highlights the efficacy of intervention for symptomatic or large renal masses.