Juvenile angifibroma

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juvenile nasopharyngeal angiofibroma

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Juvenile Angiofibroma (JA)

Also called Juvenile Nasopharyngeal Angiofibroma (JNA) - a benign but locally aggressive vascular tumor that almost exclusively affects adolescent males.

Definition & Pathology

JA is a benign vascular tumor histologically characterized by vascular endothelium-lined spaces embedded in a fibrous stroma. The vessels lack a smooth muscle layer (unlike normal arteries), sitting beside a conventional arteriocapillary tree that does have muscle layers. Immunohistochemistry and electron microscopy suggest it is better classified as a vascular malformation (hamartoma) rather than a true neoplasm.

Cummings Otolaryngology, p. 988

Pathogenesis

The leading theory (Schick et al.) proposes that JA arises from incomplete regression of the first branchial arch artery, which forms during embryogenesis between days 22-24 as a temporary connection between the ventral and dorsal aorta. Remnants of this regression may form the nidus of JA, supported by the finding that JA vessels express laminin α2, a marker for early angiogenesis.

Molecular heterogeneity has been documented, with variable expression of: bFGF, H-Ras, IL-6, c-Kit, c-Myc, PDGFa, TP53, VEGFA mRNA, and β-catenin. Recent RNA sequencing studies support upregulation of VEGFA and activation of the FGFR pathway (implicated in angiogenesis).

Regarding hormonal influence: testosterone stimulation and oestrogen hypersensitivity at puberty are thought to cause nasal mucosal target cells to develop into muscularized vascular channels - explaining the male adolescent predilection.

Cummings Otolaryngology, p. 988; Scott-Brown's Vol 1, p. 2899

Epidemiology

Almost exclusively in adolescent males (10-25 years)
Peak incidence around puberty (~14-17 years)
Most involute after hormonal maturation
Rare in females - if diagnosed, the diagnosis should be reconsidered

Site of Origin

The pathognomonic epicenter is the pterygopalatine fossa, specifically at the level of the sphenopalatine foramen or the base of the pterygoid process / superior choana (per recent imaging-based studies).

Patterns of spread (Fig. 50.7):

Direction	Extension into
Medial	Nasopharynx, nasal cavity via sphenopalatine foramen
Superior	Sphenoid sinus floor, floor of middle cranial fossa
Lateral	Pterygopalatine fossa → pterygomaxillary fissure → infratemporal fossa
Anterior	Posterior wall of maxillary sinus (pushed forward)
Orbital	Via inferior orbital fissure → proptosis
Intracranial	Via middle cranial fossa erosion

Bone involvement occurs via: (1) pressure resorption (subperiosteal growth), or (2) invasion of cancellous bone at the pterygoid root with expansion into the greater wing of sphenoid.

Cummings Otolaryngology, p. 988

Clinical Features

Early/Small lesions:

Unilateral nasal obstruction (most common)
Epistaxis (often recurrent, may be severe enough to cause anaemia)

Advanced lesions:

Swelling of the cheek (infratemporal fossa involvement)
Proptosis + diplopia (orbital invasion)
Headache (cranial fossa involvement)
Conductive hearing loss (Eustachian tube obstruction)

Endoscopic appearance: A smooth, hypervascularized polypoid mass behind the middle turbinate (which is laterally displaced), completely obstructing the choana - in a teenage boy this is virtually diagnostic.

⚠️ Biopsy is contraindicated - carries high risk of severe hemorrhage.

Endoscopic view of JA - hypervascularized mass behind middle turbinate

Endoscopic view: JA appearing as a polypoid hypervascularized mass with the choana completely obstructed (Cummings Otolaryngology, Fig. 50.8)

Imaging

CT findings:

Mass centered in pterygopalatine fossa with erosion of the base of the medial pterygoid plate
Intense contrast enhancement (hypervascular)
Anterior bowing of posterior maxillary sinus wall (Holman-Miller sign / Antral sign)

MRI findings:

Intense enhancement on contrast T1
"Salt and pepper" appearance - multiple signal voids (flow voids) on T1 and T2 = major intralesional vessels (pathognomonic)
Better delineates intracranial extension and orbital involvement

DSA (Digital Subtraction Angiography):

Enlarged intratumoral vessels + intense inhomogeneous tumor blush in venous phase
Maps vascular supply before embolization
Primary supply: branches of external carotid artery (internal maxillary, ascending pharyngeal)
Advanced lesions: internal carotid artery supply in ~35.6% of cases; bilateral supply in ~30.8%
Cummings Otolaryngology, p. 989; Scott-Brown's Vol 1, p. 2907

Staging

Several systems exist. The most widely used is based on extent of disease with special attention to:

Infratemporal fossa extension
Skull base involvement
Intracranial invasion

The Snyderman/UPMC staging system (2010) emphasizes:

Residual vascularization from internal carotid artery after embolization
Route of intracranial growth - medial vs lateral to ICA and cavernous sinus - as key predictors for endoscopic resectability

Cummings Otolaryngology, p. 990

Treatment

1. Preoperative Embolization

Standard adjunct performed 48 hours before surgery
Reduces intraoperative bleeding dramatically, improves tumor border visualization
Uses: polyvinyl alcohol (PVA) particles, liquid agents (NBCA, Onyx), via superselective intra-arterial catheterization
Direct puncture technique with Onyx injection improves devascularization, especially when ICA branches supply the tumor (transarterial approach risks neurological deficit in these cases)
Some surgeons now consider embolization unnecessary for smaller tumors accessible endoscopically (maxillary artery can be clipped at start of dissection)

2. Surgery - Mainstay of Treatment

Endoscopic resection has replaced open approaches for most cases (small, intermediate, and selected large tumors)
Key surgical principles:
- Dissection in the subperiosteal plane
- Bipolar coagulation
- Extensive drilling of the basisphenoid (removes cancellous bone with tumor digitations - Howard et al. showed this dramatically reduces recurrence)
Multiportal approaches (transnasal + transoral or transorbital) for advanced lesions
Open approaches (midfacial degloving, infratemporal fossa) reserved for extensive ICA encasement or cavernous sinus involvement

3. Radiotherapy

Used as an alternative or adjunct for intracranial involvement, unresectable disease, or recurrence
Stereotactic radiosurgery also reported

4. Hormone therapy / Medical

Antiandrogens and oestrogens have been tried (given hormonal dependence) but are not standard
Flutamide (anti-androgen) has been used preoperatively to reduce tumor size in some series

Recurrence

Residual disease is the most common reason for "recurrence" (incomplete initial resection)
Systematic removal of involved sphenoid cancellous bone is the single most important step to reduce this
Residual disease may spontaneously involute on serial MRI follow-up (particularly after puberty)
MRI is the follow-up modality of choice

Key Points Summary

Feature	Detail
Type	Benign, locally aggressive vascular hamartoma
Who	Adolescent males only
Origin	Pterygopalatine fossa / sphenopalatine foramen
Classic symptoms	Unilateral nasal obstruction + epistaxis
Biopsy	Contraindicated (hemorrhage risk)
Imaging hallmark	Salt-and-pepper on MRI; Holman-Miller sign on CT
Vascular supply	External carotid (IMA) ± ICA in advanced disease
Treatment	Surgery (endoscopic) ± preoperative embolization
Recurrence driver	Residual tumor in sphenoid cancellous bone

Sources: Cummings Otolaryngology Head and Neck Surgery, pp. 988-990; Scott-Brown's Otorhinolaryngology Head & Neck Surgery Vol 1, pp. 2889-2940

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