SPG: when to consider treatment

When SPG Is Considered

Treatment of the sphenopalatine ganglion (SPG) is not a first-line therapy.
It is considered only in carefully selected patients, within a specialist pathway for complex craniofacial pain.

The sphenopalatine ganglion (SPG) represents one of the main neuro-autonomic nodes involved in trigeminal autonomic cephalalgias, such as cluster headache, and in some presentations of complex craniofacial pain.

The indication does not derive from a single symptom, but from a comprehensive clinical assessment that takes into account:

• characteristics of the pain
• temporal pattern
• response (or lack of response) to previous treatments
• presence of associated autonomic signs

Conditions Under Consideration and Limitations of Evidence

Resistant Cluster Headache

In particular:

• resistant cluster headache
• chronic or high-frequency forms
• presentations with marked autonomic component (lacrimation, nasal congestion, rhinorrhoea)

The diagnosis must be confirmed and usual therapies reassessed: oxygen and sumatriptan for attacks, verapamil for prevention when appropriate. Lacrimation or nasal congestion alone are not sufficient to indicate a procedure. Evidence on SPG neurostimulation does not equate to evidence on pulsed radiofrequency. EAN guidelines on cluster headache.

Complex and Refractory Craniofacial Pain

These elements require specialist reassessment, but do not in themselves constitute indications for SPG treatment:

• persistent facial pain
• failure of conventional pharmacological therapies
• presentations not attributable to a single “classic” neuralgia
• associated dysautonomic component

For persistent facial pain, evidence is limited and depends on diagnosis and technique. Failure of medications does not automatically identify the SPG as a target.

Pain Defined as “Atypical”: Diagnosis First

Expressions such as the following describe pain, but are not diagnoses:

• with atypical pattern
• with partial or absent response to medications
• with distribution not strictly trigeminal

It is necessary to distinguish neuralgia, neuropathy, and persistent idiopathic facial pain. The term “atypical” alone does not justify an invasive procedure.

Post-Surgical or Post-Traumatic Pain (Selected)

In selected cases of:

• persistent pain after facial bone surgery
• post-traumatic craniofacial pain

local causes and nerve lesions must first be investigated. Results from blocks used for acute postoperative pain do not demonstrate the efficacy of radiofrequency for chronic post-traumatic pain.

When to Reassess or Defer a Procedure

An invasive procedure requires particular reassessment in the presence of:

• nonspecific facial pain without diagnostic classification
• primary headaches well controlled by pharmacological therapy
• absence of a diagnosis and a defined therapeutic objective
• expectation of a “quick fix” without clinical pathway

The indication depends on the procedure: a block may be used even for temporary relief, while radiofrequency requires a separate assessment.

The Specialist Assessment Pathway

PONOS Clinic’s approach to the sphenopalatine ganglion is based on a structured pathway, which includes:

• Comprehensive Specialist Clinical Assessment
• Analysis of Clinical Documentation and Imaging
• Possible Diagnostic Transmucosal Test
• Assessment of Anatomy and Need for Dedicated CT
• Consideration of Pulsed Radiofrequency Only If Indicated

Each phase has a precise meaning.
No step is automatic.

The Role of CT in Studying the Sphenopalatine Ganglion

When useful for planning percutaneous access, CT of the facial bones or skull base:

• allows assessment of individual anatomy
• identifies relevant anatomical variants
• helps assess the access route
• documents relationships with nearby bony structures

CT does not demonstrate that the SPG is the cause of pain and is not an automatic examination for every patient or before every transmucosal block. The request depends on the clinical question and the planned procedure.

To learn more about the role of CT in studying the sphenopalatine ganglion, visit this page.

For a comprehensive overview of the diagnostic and therapeutic pathway, visit the page
Turin Headache Centre – Resistant migraines and craniofacial pain

Clinical experience

Radiofrequency of the sphenopalatine ganglion has been performed by Dr Evangelos Panagiotakos MD for many years, with experience in managing resistant headaches and complex craniofacial pain.

Request a specialist assessment

Pathway Map – SPG

The specialist pathway for sphenopalatine ganglion treatment.

The Transmucosal Test: Value and Limitations

The transmucosal block with local anaesthetic may offer temporary relief and clinical information. The response is not specific proof that the pain originates from the SPG.

It is important to clarify that:

• the block may have a temporary therapeutic effect
• a positive response does not guarantee the success of more advanced treatments
• a negative response does not automatically rule out SPG involvement

The test must be interpreted in the overall clinical context, not in isolation.

→ dedicated page: “Transmucosal Test of the Sphenopalatine Ganglion”

Pulsed Radiofrequency of the Sphenopalatine Ganglion

Pulsed radiofrequency of the SPG aims to modulate nerve activity, limiting thermal effect. It differs from anaesthetic block, thermal lesional radiofrequency, and neurostimulation with an implanted device.

It is performed:

• in a suitable environment, with sterility precautions and monitoring
• under instrumental (fluoroscopic) guidance
• with parameters selected on a case-by-case basis

The goal is to reduce pain, but benefit is not guaranteed. Bleeding, infection, sensory disturbances, and access-specific risks must also be discussed. Non-lesional intent does not equate to absence of risks.

→ dedicated page: “Pulsed Radiofrequency of the Sphenopalatine Ganglion”

How to Assess Benefit

In correctly selected patients, benefits may include:

• reduction in pain intensity
• reduction in attack frequency
• improvement in quality of life

A diary of attacks, medications, and daily activities helps assess benefit and duration. Studies on the SPG are heterogeneous and often small: they do not allow individual promises or transfer of results from one technique to another. Systematic review on blocks, radiofrequency, and neurostimulation.