The Painful Numbness Paradox: Surgical Strategies and Challenges in Treating Trigeminal Anesthesia Dolorosa

Anesthesia dolorosa (AD) is a rare and debilitating deafferentation pain syndrome that can occur after an injury to the trigeminal system, often after procedures for trigeminal neuralgia. Management remains challenging, with limited high-quality evidence and no consensus regarding optimal treatment. This narrative review evaluates procedural strategies for trigeminal AD and AD-spectrum trigeminal deafferentation pain.

We performed a narrative literature review of procedural approaches for trigeminal AD and AD-spectrum trigeminal deafferentation pain with no date or language restrictions. Articles were grouped by anatomic and mechanistic intervention category, including motor cortex stimulation and somatosensory cortex stimulation, deep brain stimulation, thalamic stimulation and lesioning, nucleus caudalis/dorsal root entry zone and trigeminal nucleotomy procedures, trigeminal/sphenopalatine ganglion interventions, spinal/cervicomedullary stimulation and other approaches.

A total of 54 studies were included. The literature was dominated by retrospective case series and case reports, with substantial heterogeneity in patient selection, procedural technique, outcome definitions, and follow-up duration. Motor cortex stimulation and deep brain stimulation showed benefit in some patients, but responses were inconsistent and durability varied. Thalamic lesioning, nucleus caudalis procedures and peripheral or ganglion-targeted interventions produced mixed results, with variable response rates and procedure-specific morbidity. Cross-study synthesis was limited by inconsistent reporting and a lack of standardized pain and functional outcome measures.

Evidence for procedural treatment of trigeminal AD remains low quality and heterogeneous. Reversible neuromodulatory approaches may benefit selected patients, but durability and predictors of response remain uncertain. Ablative procedures produced analgesic responses in small, selected reports but require cautious interpretation because of irreversibility, limited evidence, and target-site morbidity. Larger multicenter data sets with standardized diagnostic definitions and outcome reporting are required.