Bilateral variation of the pectoralis minor muscle discovered during practical dissection |
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Authors: | A-P Uzel R Bertino P Caix P Boileau |
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Institution: | Service d'orthopédie et traumatologie, CHU Pointe-à-Pitre, Route de Chauvel, 97159, Pointe-à-Pitre Cédex, Guadeloupe, France. andre-pierre.uzel@wanadoo.fr |
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Abstract: | We describe a case of an original insertion of the pectoralis minor on the coracohumeral ligament, supraspinatus tendon and
the capsule of the glenohumeral joint. This variation has been described in anatomy textbooks since the nineteenth century.
The peculiarity of this case is that the right shoulder presented type 2 and the left type 1 of the three varieties described
by Le Double in 1897. Le Double (1843–1913) was a French anatomist who wrote a treaty on anatomical variations, in particular
those of the muscle. Lately, only three publications have reported this variation in anatomic studies. Some authors have described
the rotator cuff syndrome caused by this variation and an ultrasound study has demonstrated a frequency of 9.57% for the detection
of this variation. It is possible to try and find this variation while investigating in order to diagnose impingement, through
ultrasound, CT arthrography or MRI. We believe that this variation should be taken into consideration by surgeons during surgical
procedures and arthroscopy. |
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Keywords: | Pectoralis minor Anomalous insertion Coracohumeral ligament Impingement Capsule |
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