Summary of the Ultrasound (USG Abdomen & Pelvis) - 15-year-old male

1. Prominent gaseous bowel loops.
2. A blind-ended, non-peristaltic tubular structure with a maximum transverse diameter of 5.8 mm in the right iliac fossa - this description refers to the appendix.
3. Multiple subcentimetric to mildly enlarged lymph nodes with preserved fatty hilum in the para-aortic, peri-umbilical, and right iliac fossa regions, the largest measuring 14 x 7 mm - reported as suggestive of mesenteric lymphadenopathy.

What this indicates

• The appendix diameter of 5.8 mm is below the standard sonographic cut-off (6-7 mm) used to diagnose acute appendicitis - per Bailey & Love's Short Practice of Surgery, "definitive exclusion of appendicitis hinges on identification of a normal appendix measuring less than 6 mm in diameter," and Rosen's Emergency Medicine uses >6-7 mm plus wall thickening/non-compressibility as positive criteria. Here the appendix is essentially normal-caliber, with no wall thickening, fat stranding, or peri-appendiceal fluid mentioned.
• The mesenteric nodes are enlarged but preserve a fatty hilum, a reassuring/benign, reactive pattern (nodes that lose the fatty hilum or appear rounded/hypoechoic raise concern for lymphoma or tuberculous adenitis, which is not described here).
• Mesenteric lymphadenitis classically presents in children/adolescents with right lower quadrant pain that mimics appendicitis clinically, often following a viral illness or occasionally Yersinia/Campylobacter enteritis (Swanson's Family Medicine Review; StatPearls - Mesenteric Adenitis).

Management

1. Clinical correlation first - this is a radiology report; the treating physician must correlate with exam (RLQ tenderness, guarding, fever), CBC, and CRP/ESR before finalizing management.
2. If clinically well and pain mild-moderate: manage conservatively -
   • Supportive care: hydration, rest, antipyretics/analgesics (paracetamol or ibuprofen).
   • No antibiotics are routinely needed for viral-associated mesenteric lymphadenitis; antibiotics are reserved if a bacterial enteritis (e.g., Yersinia, Campylobacter, Salmonella) is suspected/confirmed on stool studies.
   • No surgery is indicated since the appendix is not enlarged/inflamed on this scan.
3. Observation: Re-examine within 24-48 hours (or sooner if pain worsens, fever spikes, vomiting develops, or peritoneal signs appear) to catch evolving appendicitis, since early appendicitis can occasionally look equivocal on a single scan.
4. Follow-up imaging: Reasonable to repeat ultrasound in 4-6 weeks if nodes are large or symptoms persist, to confirm resolution. Mesenteric lymphadenitis is typically self-limited, with full recovery often taking up to 3-4 weeks.
5. Red flags warranting further work-up (not present here, but worth excluding if the picture changes): persistent/progressively enlarging nodes, loss of fatty hilum, systemic B symptoms (weight loss, night sweats), or persistently high inflammatory markers - these would prompt CBC with differential, LDH, possibly chest X-ray/PPD for TB, and specialist (pediatric surgery/oncology) referral to exclude lymphoma or tuberculous mesenteric lymphadenitis.