Accessory extensor pollicis longus from the extensor digitorum: a rare case report and review of the literature
1
Issued Date
2023-01-01
Resource Type
ISSN
09301038
eISSN
12798517
Scopus ID
2-s2.0-85153926833
Journal Title
Surgical and Radiologic Anatomy
Rights Holder(s)
SCOPUS
Bibliographic Citation
Surgical and Radiologic Anatomy (2023)
Suggested Citation
Taradolpisut N., Suwannakhan A., Berkban T., Chaiyamoon A., Yurasakpong L., Iwanaga J., Tubbs R.S., Kruepunga N., Georgiev G.P., Samrid R. Accessory extensor pollicis longus from the extensor digitorum: a rare case report and review of the literature. Surgical and Radiologic Anatomy (2023). doi:10.1007/s00276-023-03155-2 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/82490
Title
Accessory extensor pollicis longus from the extensor digitorum: a rare case report and review of the literature
Author's Affiliation
Graduate School of Medical and Dental Sciences
St. George's University Grenada
The University of Queensland
University Hospital 'Queen Giovanna '
Faculty of Medicine, Khon Kaen University
Chulabhorn Royal Academy
Ochsner Health System
Tulane University School of Medicine
Mahidol University
In Silico and Clinical Anatomy Research Group (iSCAN)
St. George's University Grenada
The University of Queensland
University Hospital 'Queen Giovanna '
Faculty of Medicine, Khon Kaen University
Chulabhorn Royal Academy
Ochsner Health System
Tulane University School of Medicine
Mahidol University
In Silico and Clinical Anatomy Research Group (iSCAN)
Other Contributor(s)
Abstract
Purpose: Variations of the extensor pollicis longus are rare. When present, these include a separate extensor pollicis longus muscle, tendon or an intertendinous connection with nearby tendons within the deep extensor compartment of the forearm. Here, we report an extremely rare variation of an accessory extensor pollicis longus originating from the extensor digitorum. Methods: An unusual muscle was found during the routine dissection forearm of a 71 year-old at death male cadaver. Results: This variant muscle originated from part of the extensor digitorum muscle belly that supplies the index finger. It became tendinous and entered the third extensor compartment of the wrist before joining the ulnar side of the extensor pollicis longus tendon. Traction on the muscle belly resulted in simultaneous extension of both the thumb and the index finger. Conclusion: This study documents an extremely rare extensor tendon to the thumb originating from the extensor digitorum, with a unique attachment to the normal extensor pollicis tendon. There have been minimal accounts of this variation, and the present report adds to the limited literature. Furthermore, the report suggests a new subtype, 1f, be included in the existing classification system. Surgeons should be aware of this rare variant for proper evaluation, diagnosis and surgical treatment. Further anatomical studies are needed to study the prevalence of this variant.