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Usefulness of Magnetic Resonance Neurography for Diagnosis of Piriformis Muscle Syndrome and Verification of the Effect After Botulinum Toxin Type A Injection: Two Cases

 Hea Eun Yang  ;  Jung Hyun Park  ;  Sungjun Kim 
 MEDICINE, Vol.94(38) : 1504, 2015 
Journal Title
Issue Date
Botulinum Toxins, Type A/administration & dosage* ; Diagnostic Techniques, Neurological ; Humans ; Injections, Intramuscular ; Magnetic Resonance Imaging/methods ; Male ; Middle Aged ; Piriformis Muscle Syndrome*/diagnosis ; Piriformis Muscle Syndrome*/therapy ; Radiography ; Sciatic Nerve/diagnostic imaging* ; Treatment Outcome
Piriformis muscle syndrome (PMS) is a controversial neuromuscular disorder that is presumed to involve compression neuropathy of the sciatic nerve at the level of the piriformis muscle. Botulinum toxin A (BTX-A) injection into the piriformis muscle is widely used as a treatment aimed at relieving sciatic nerve compression. In 2 patients with PMS, magnetic resonance neurography (MRN) was taken before and after BTX-A injection. The first MRN was performed as a diagnostic tool, and the second to identify the effect of the treatment. Signal change of the sciatic nerve under the hypertrophied piriformis muscle was confirmed by MRN. In follow-up MRN performed after BTX-A injection into the piriformis muscle, changes of the sciatic nerve and piriformis muscle were noticed as well as improvement of clinical symptoms. MRN is a useful tool to add certainty of diagnosis and verify the effect of treatment in PMS.
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1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Rehabilitation Medicine (재활의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Sungjun(김성준) ORCID logo https://orcid.org/0000-0002-7876-7901
Park, Jung Hyun(박중현) ORCID logo https://orcid.org/0000-0003-3262-7476
Yang, Hye Eun(양혜은)
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