Hypertrophy of palmaris longus muscle, a rare anatomic aberration

Barkáts, N.

doi:10.5603/fm.2015.0040

Cited by 10 publications

(12 citation statements)

References 16 publications

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“…The RPLM is a rare variation of the PLM, although it has been consistently described in the literature [3, 6, 10-13, 15, 17, 19]. Despite that, the presence of an abnormally large and fully fleshed PLM as reported herein was not previously described in the literature, although three similar cases were described [2,13,16].…”

Section: Discussioncontrasting

confidence: 44%

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Hypertrophic reversed palmaris longus muscle: a cadaveric finding

et al. 2018

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Section: Discussioncontrasting

confidence: 44%

“…The excessive pressure on nerves caused by supernumerary or hypertrophic muscles can cause pain and numbness of the forelimb [3-5, 9, 11, 22]. The RPLM has been associated with MN compression [2,3,12,17,19].…”

Section: Discussionmentioning

confidence: 99%

Hypertrophic reversed palmaris longus muscle: a cadaveric finding

et al. 2018

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“…16 Imaging modalities like ultrasonography, or magnetc resonance imaging, may reveal the diagnosis, but most of the time, it is an intra operative fonding that is discovered in most patients, as also in our patient. 17,18 The palmaris longus (PL) is a fusiform muscle of the superficial flexor compartment of the forearm. It originates together with other superficial forearm flexors from the medial epicondyle and is covered by the anterobrachial fascia.…”

Section: Discussionmentioning

confidence: 99%

Hypertrophied reverse palmaris longus muscle: a rare cause of carpal tunnel syndrome

2020

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Carpal tunnel syndrome (CTS) is usually secondary to compression or irritation of the median nerve in the fibro-osseous canal formed by the flexor retinaculum (transverse carpal ligament) and the carpal bones. The prevalence of CTS in the general population is about 7 to 19%. Several causes both local and systemic have been described, but CTS due to aberrant musculature are rare. Here we report a case of a middle-aged female with paresthesia of the hand and a positive Phalen’s test with nerve conduction study of the median nerve showing sensorimotor neuropathy. The patient underwent surgery for open CTS release where we found a hypertrophied reverse palmaris longus muscle attached to the palmar aponeurosis which was excised along with its proximal tendon. On post-operative follow up all the symptoms of CTS were completely resolved. Muscle abnormalities concern three muscles: the palmaris longus, the flexor digitorum superficialis of index, and the lumbricals. These muscles can be hypertrophied, bifid, duplicated, digastric, inverted or have an abnormal insertion, thus creating a mechanical restriction of the carpal tunnel. Surgical resection of abnormal muscle provides excellent functional recovery.

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“…In that case there would be need for relying solely on bone structure landmark palpation [2]. Inverted PL, which needs to be brought to attention due to its correlation with median nerve compression [4], has been marked as a true-positive in Shaeffer's test. The observed variations, including barely visible tendon, ramified tendon and inverted PL, fall into the category of quality variations and have been observed and described before [8,18].…”

Section: Discussionmentioning

confidence: 99%

“…PL presents very high morphological variability. The most common variation is its absence which seems to depend on ethnicity and range from 0,17% in Nigerians to 63,9% in Turkish and Indian population [4,9,19,21]. Its absence or presence doesn't seem to have any impact on biomechanical functions of the upper limb [3,14].…”

Section: Introductionmentioning

confidence: 99%