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Abstract
Findings were in accordance with a diagnosis of small bowel obstruction. Since the patient complained right medial thigh pain, we took a quick look of this area before ending the scan. On axial scan of the right inguinal region, a hypoechoic mass was incidentally discovered by low-frequency convex probe (C5-2) [Figure 1]a. With high-frequency linear probe (L9-3), the mass with US features of edematous intestinal wall was more clearly depicted, and we found that it was deep to the pectineus muscle and common femoral vessels [Figure 1]b and [Figure 1]c. The diagnosis of small bowel obstruction secondary to obturator hernia was established. The subsequent computed tomography (CT) also demonstrated a small bowel loop herniating through the obturator foramen, lying between the pectineus and obturator muscles [Figure 1]d. The patient had laparotomy, and a hernia sac containing peritoneum and small intestine passing below the superior pubic ramus was discovered, which confirmed...