The anatomic splenic flexure: an ultrasonic renal impostor

Area of Science:

• Radiology
• Medical Imaging
• Anatomy

Background:

• Congenital anomalies of the kidney, such as renal agenesis or ectopia, can lead to atypical anatomical presentations.
• The splenic flexure of the colon may occupy unusual anatomical spaces when the left kidney is absent or misplaced.

Observation:

• Ultrasonic imaging of patients with unilateral renal agenesis or ectopia can reveal the splenic flexure of the colon in the left renal fossa.
• The colon, when distended with stool or fluid, may appear as a mass on ultrasound, potentially simulating a renal mass or tumor.
• Characteristic appearances include a comma shape on transverse scans and poorly defined inferior margins on longitudinal scans.

Findings:

• The splenic flexure of the colon can be mistaken for a renal mass or ectopic kidney on ultrasonography in patients with left renal anomalies.
• Distinguishing between colonic structures and actual renal masses is critical for appropriate patient management.

Implications:

• Accurate diagnosis is essential to avoid unnecessary interventions or misdiagnosis in patients with congenital renal anomalies.
• Integrating conventional radiologic techniques with ultrasonography improves diagnostic accuracy in evaluating patients with solitary right kidneys.