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Renal Dromedary hump

Renal Dromedary hump ultrasound case study

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Renal Pathology

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Renal dromedary hump ultrasound case study

Case Study Record

SN	Case Name	Report Line
1	Right renal dromedary Hump	View Report Line
2	Left renal dromedary Hump	View Report Line
3	Bilateral renal dromedary Hump	View Report Line

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CASE–1
Left Renal Dromedary Hump

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Clinical History

A 42-year-old patient presented for routine abdominal and renal ultrasound examination. There was no significant history of flank pain, hematuria, dysuria, recurrent urinary tract infection, or renal surgery. The examination was performed as part of a general abdominal sonographic evaluation.

Ultrasound Findings

Ultrasound examination of the left kidney demonstrates a smooth, focal bulging contour along the lateral aspect of the mid renal cortex. The bulge follows the echogenicity and corticomedullary architecture of the adjacent renal parenchyma and shows preserved normal renal echotexture. There is no focal cortical thinning, cortical defect, calcification, hydronephrosis, or perirenal collection. The lesion does not demonstrate a separate mass effect or abnormal internal vascularity. The appearance is characteristic of a left renal dromedary hump, representing a normal anatomical cortical variant.

Ultrasound of the left kidney. Sonographic image demonstrates a smooth focal cortical bulge along the lateral aspect of the left kidney, with preserved renal parenchymal echotexture and corticomedullary differentiation, consistent with a dromedary hump.

Color Doppler ultrasound of the left kidney. The prominent cortical region demonstrates preserved vascularity similar to the adjacent renal parenchyma, supporting the diagnosis of a benign renal cortical contour variant rather than a focal renal mass.

Report Line

Smooth focal cortical bulge along the lateral aspect of the mid left kidney, demonstrating preserved renal parenchymal echotexture, corticomedullary differentiation, and vascularity, consistent with a left renal dromedary hump. No focal renal mass or hydronephrosis identified.

Impression

Left renal dromedary hump — benign anatomical cortical variant.

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Recommendation

No specific treatment or follow-up is required for an uncomplicated renal dromedary hump when the sonographic appearance is characteristic. Clinical correlation is advised. If the cortical bulge demonstrates atypical features, altered echogenicity, focal vascular abnormalities, or loss of normal corticomedullary architecture, further evaluation with appropriate cross-sectional imaging may be considered to exclude a renal mass.

Key Learning Points

• A renal dromedary hump is a benign normal anatomical variant of renal cortical contour.
• It is most commonly seen along the lateral aspect of the left kidney.
• The bulging cortex maintains the same echogenicity and corticomedullary architecture as the adjacent renal parenchyma.
• Color Doppler demonstrates preserved vascularity continuous with the normal renal cortex.
• Recognition of this normal variant is important to avoid misdiagnosis as a renal cortical mass.
• A dromedary hump should not produce focal cortical destruction, abnormal echotexture, or distortion of the normal renal architecture.
• If the appearance is atypical or indeterminate on ultrasound, contrast-enhanced CT or MRI may be considered for further characterization.