Juvenile nasopharyngeal angiofibroma

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ENT Oncology: Juvenile Nasopharyngeal Angiofibroma (JNA)

High-Yield Revision Notes for Board Review & PG Entrance Examinations

Juvenile Nasopharyngeal Angiofibroma (JNA) is a rare, histologically benign, but locally aggressive, highly vascular tumor. It arises almost exclusively in adolescent males, typically from the region of the sphenopalatine foramen.

1. Clinical Presentation

  • Demographics: Almost exclusively seen in males aged 10–25 years.
  • Classical Triad:
    • Unilateral, recurrent, profuse epistaxis (the hallmark).
    • Nasal obstruction.
    • Nasopharyngeal mass.
  • Physical Signs:
    • Holman-Miller sign (Antral Sign): Anterior bowing of the posterior wall of the maxillary sinus seen on lateral X-ray/CT.
    • “Frog-face” deformity (in advanced cases due to facial bone remodeling).

2. Diagnostic Caution & Imaging

  • WARNING: Biopsy is CONTRAINDICATED in the office due to the risk of life-threatening, massive hemorrhage.
  • Imaging:
    • CECT: Shows a mass centered at the sphenopalatine foramen with intense enhancement.
    • MRI/MRA: Ideal for evaluating intracranial extension.
    • Digital Subtraction Angiography (DSA): The diagnostic gold standard, which also allows for preoperative embolization to reduce intraoperative bleeding.

3. Management

  • Primary Treatment: Surgical Excision is the standard of care.
  • Pre-op Protocol: Embolization of the Internal Maxillary Artery (feeding vessel) 24–48 hours before surgery.
  • Surgical Approaches: Depends on staging (Fisch classification). Approaches include endoscopic resection (for small/moderate tumors), transpalatal, or lateral rhinotomy.
  • Adjuvant Therapy: Radiotherapy is reserved only for recurrent, intracranial, or unresectable lesions.

4. Key Board Examination Facts

Point High-Yield Detail
Hormonal Sensitivity The tumor expresses androgen receptors (hence its prevalence in young males).
Histology Consists of thin-walled, endothelium-lined vascular spaces embedded in a dense, fibrous, collagenous stroma.
Primary Arterial Supply Internal Maxillary Artery (branch of External Carotid).
Fisch Staging Staging system used to classify the extent from limited (Stage I) to intracranial/cavernous sinus involvement (Stage IV).