Renal smooth muscle hamartoma.

Area of Science:

• Nephrology
• Oncology
• Genetics

Background:

• Smooth muscle tumors of the kidney are rare, with varying degrees of cellularity and potential for malignancy.
• Distinguishing benign from malignant renal masses is crucial for appropriate patient management.

Observation:

• A 4 cm smooth muscle tumor was detected in the medial aspect of the right kidney of a 54-year-old Caucasian woman presenting with acute hypertension.
• The patient's clinical presentation included severe hypertension.
• The tumor was large, measuring 4 cm in diameter.

Findings:

• Clonality assays using the HUMARA assay demonstrated no evidence of clonal proliferation, ruling out a neoplastic process.
• Array comparative genomic hybridization (aCGH) analysis did not reveal any copy number genomic alterations.
• Histopathological and genetic findings were consistent with a diagnosis of smooth muscle hamartoma.

Implications:

• The findings support smooth muscle hamartoma as a rare, benign renal tumor-like lesion.
• This diagnosis excludes malignancy, suggesting a favorable prognosis for the patient.
• Further research into the pathogenesis of renal smooth muscle hamartomas may be warranted.