A Complex Case: Unraveling the Diagnostic Challenge of a 13-Year-Old Boy

QUESTION

Patient: David Chang Date: 13 February 2022 MRN: C55359541 Attending Physician: Evangeline DeRupo, MD HPI: A 13-year-old boy had been well until 4 weeks before admission, when he developed a cough, periorbital edema, ankle swelling, headaches, and upper abdominal discomfort. On admission, he was febrile with facial and ankle edema; there were generalized, superficial lymphadenopathy; numerous adventitial sounds in the lungs; and mild hypertension (BP 140/110). His hemoglobin was 72 g/l with a normal white-cell count and an erythrocyte sedimentation rate (ESR) of 137 mm/h. His blood urea was high (27.5 mmol/l) with a low serum bicarbonate (13.6 mmol/l) and serum albumin (19 g/l). His creatinine clearance was 45 ml/min/m2 with urinary protein loss of 6.7 g/day. His serum CH50 was low (14 U/ml; NR 25-45), as was his C3 level (0.20 g/l; NR 0.8-1.4); his C4 level was normal (0.30 g/l; NR 0.2-0.4). A chest x-ray showed several rounded opacities in both lungs. These were presumed to be infective and treated with amoxycillin and flucloxacillin with resolution of the radiological findings. The association of a low C3 with acute glomerulonephritis suggested acute poststreptococcal disease as the most likely diagnosis, although no streptococci were isolated and streptococcal antibodies were not

ANSWER

A Complex Case: Unraveling the Diagnostic Challenge of a 13-Year-Old Boy

Introduction

David Chang’s case presents a diagnostic challenge that underscores the complexity of pediatric medicine. A 13-year-old boy with a sudden onset of multiple symptoms, including a persistent cough, edema, abdominal discomfort, and hypertension, has left healthcare providers puzzled. This essay delves into the details of David’s case, his symptoms, and the diagnostic considerations made by attending physician Dr. Evangeline DeRupo.

The Clinical Presentation

Symptoms and Physical Examination: David’s symptoms include periorbital edema, ankle swelling, headaches, upper abdominal discomfort, and fever. On examination, he displayed facial and ankle edema, generalized superficial lymphadenopathy, and numerous adventitial sounds in the lungs. Hypertension was also noted, with a blood pressure of 140/110 mm Hg.

Laboratory Findings: Several laboratory abnormalities further complicated the diagnostic process. David’s hemoglobin was significantly low at 72 g/l, and he had elevated erythrocyte sedimentation rate (ESR) at 137 mm/h. Abnormalities in blood urea (27.5 mmol/l), serum bicarbonate (13.6 mmol/l), and serum albumin (19 g/l) were also observed. His creatinine clearance was diminished at 45 ml/min/m2, with substantial urinary protein loss of 6.7 g/day. Additional laboratory findings showed a low serum CH50 (14 U/ml) and low C3 level (0.20 g/l), while C4 levels remained within the normal range (0.30 g/l).

Diagnostic Considerations

Acute Poststreptococcal Disease: The low C3 level and clinical presentation strongly suggested acute poststreptococcal glomerulonephritis as the primary diagnosis. Although streptococci were not isolated and streptococcal antibodies were not detected, this condition remained a leading possibility due to its association with low C3 levels.

Radiological Findings: The presence of rounded opacities in both lungs, initially presumed to be infective, led to the administration of antibiotics, resulting in the resolution of radiological abnormalities. However, the origin of these lung opacities remains uncertain.

Conclusion

David Chang’s case represents a diagnostic conundrum in pediatric medicine. While acute poststreptococcal glomerulonephritis appears to be a leading consideration due to his low C3 levels, the absence of streptococcal isolation and antibodies raises questions. Additionally, the lung opacities observed on the chest x-ray introduce another layer of complexity to his diagnosis. David’s case emphasizes the need for thorough and comprehensive evaluations, interdisciplinary collaboration, and further investigations to unravel the underlying cause of his symptoms and provide him with the appropriate care and treatment.