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Ectopic adrenal tissue in the kidney: A systematic review
Davide De Marchi1, Alessandro Tafuri2, Guglielmo Mantica3
1Department of Urology, San Raffaele Hospital, Milan. demarchidavide82@gmail.com.
Summary
Ectopic adrenal tissue in the kidney is rare and can mimic renal neoplasms. Early identification of its specific clinical features is crucial for accurate diagnosis and management.
Area of Science:
- Urology
- Endocrinology
- Pathology
Background:
- Ectopic adrenal tissue in the kidney, including adrenal-renal fusion, is a rare condition.
- It can be challenging to differentiate from renal neoplasms based on clinical presentation.
Observation:
- A systematic review identified 39 patients with renal adrenal ectopia or fusion.
- Diagnosis was often incidental or due to flank pain, abdominal pain, or endocrine disorders.
- CT scans frequently showed solid, vascularized lesions resembling renal tumors.
Findings:
- Adrenal fusion typically occurred at the upper pole; adrenal rests were found in the renal parenchyma, hilum, or retroperitoneum.
- Lesions were often benign adenomas (functioning or non-functioning), but rarely underwent neoplastic degeneration.
- Key immunohistochemical markers included inhibin, vimentin, melan-A, synaptophysin, and anti-p450 scc.
Implications:
- Recognizing the specific clinical characteristics of ectopic adrenal tissue is essential.
- Accurate diagnosis is vital for appropriate treatment and management of these rare renal anomalies.
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