Subclavius Botulinum Toxin A (BTX-A) An Option for Thoracic Outlet Syndrome

Thursday, November 13, 2025

10:40 AM - 10:48 AM CT

Introduction: Neurogenic thoracic outlet syndrome (NTOS) is a complex disorder characterized by compression of the brachial plexus, resulting in pain, weakness, and sensory changes in the upper extremity. While anterior scalene muscle (ASM) is most commonly implicated, a rare aberrant presence of subclavius posticus hypertrophy because of its unique location in the costoclavicular space is reported as cause of NTOS(1). This is a case wherein successful treatment of NTOS was achieved by targeting subclavius muscle hypertrophy.

Submitting Author(s)

AT

Angelica Faith Tiongco, MD

Fellow
University Health Network - Toronto Western Hospital
Guagua, Pampanga, Philippines

Co-Author(s)

TW

Tarvit Worravitudomsuk, MD

Fellow
University Health Network - Toronto Western Hospital
Toronto, Ontario, Canada
MF

Marcos Andre Frasson Filho, MD FIPP CIPS

Fellow
University Health Network - Toronto Western Hospital
Toronto, Ontario, Canada
Pranab Kumar, MD FRCA FFPMRCA FRCPC FIPP CIPS

Assistant Professor
University Health Network - Toronto Western Hospital
Toronto, Ontario, Canada