Incidental findings and overdiagnosis in children — formative SAQs

SAQ 1 — Trauma CT incidental finding (10 marks)

A previously well 9-year-old has CT after significant blunt abdominal trauma. The scan answers the trauma question. It also reports a small simple renal cyst. The child is now comfortable, eating and haemodynamically stable. Parents are frightened by the word “cyst.” ^{[7] [4]}

Questions

1. Define incidental finding and overdiagnosis, and state how they differ from underdiagnosis. (3 marks) ^{[2] [3] [1]}
2. Classify this cyst using an act / plan / observe / stop framework and justify. (3 marks) ^{[4] [7] [6]}
3. Outline the family explanation and handover content, including residual risk. (4 marks) ^{[4] [1] [10]}

Model answer

Definitions (3). Incidental finding: unexpected result unrelated to the clinical question that prompted the test. Overdiagnosis: detection of a condition that would not have caused harm, yet still leads to a disease label, further tests or treatment. Underdiagnosis: missing disease that is present and matters. These are not interchangeable. ^{[2] [3] [1]}

Classification (3). Most simple renal cysts in a now-stable child after the trauma question is answered sit in planned follow-up or observe rather than act-now. Justify with clinical stability, likely benign morphology as reported, and avoidance of same-night cascade imaging. Escalate bin if report features are suspicious or the child is unwell. Document local radiology follow-up advice. ^{[7] [4] [6]}

Communication and handover (4). Explain: the scan answered the injury question; the cyst was an extra finding; it is not the cause of the injury; most such cysts are monitored rather than operated on urgently; return if pain, fever, haematuria or systemic change. Handover: original trauma status, incidental description, bin chosen, follow-up owner/timing, residual trauma and medical risks still open. Do not copy the cyst into the problem list as cancer. ^{[4] [1] [10]}