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17 Possible Causes for Hypertrophy of the Sternocleidomastoid Muscle

  • Thoracic Outlet Syndrome

    […] of nearby muscles ( e.g., sternocleidomastoid or scalene muscle ) more commonly in weightlifters or athletes Pancoast tumor causing compression cysts trauma Pathogenesis[step1.medbullets.com] Stretching should begin with short, tight muscles (ie, upper trapezius, levator scapulae, scalenes, sternocleidomastoid, pectoralis major, pectoralis minor, suboccipitalis[emedicine.medscape.com] […] bony cervical rib an extra rib arising from 7 th cervical vertebra rudimentary first rib soft tissue fibrous band from the first rib to the tip of C7 transverse process hypertrophy[step1.medbullets.com]

  • Secondary Hypoparathyroidism

    Upon hospitalisation, MM presented features typical of idiopathic cervical dystonia: hypertrophy of the left sternocleidomastoid muscle (SCM) and the right trapezius muscle[functionalneurology.com]

  • Adult-Onset Cervical Dystonia Type DYT23

    […] of the sternocleidomastoid muscle Isaacs syndrome (Neuromyotonia) Muscle cramps, stiffness and delayed muscle relaxation.[docplayer.net] […] the anterior aspect of the dens and posterior aspect of the anterior arch of the atlas is more than 3 mm Neck ultrasonography confirms the existence of the neck mass or hypertrophy[docplayer.net]

  • Cervical Rib Syndrome

    […] of nearby muscles ( e.g., sternocleidomastoid or scalene muscle ) more commonly in weightlifters or athletes Pancoast tumor causing compression cysts trauma Pathogenesis[medbullets.com] Stretching should begin with short, tight muscles (ie, upper trapezius, levator scapulae, scalenes, sternocleidomastoid, pectoralis major, pectoralis minor, suboccipitalis[emedicine.medscape.com] […] bony cervical rib an extra rib arising from 7 th cervical vertebra rudimentary first rib soft tissue fibrous band from the first rib to the tip of C7 transverse process hypertrophy[medbullets.com]

  • Bruxism

    See Table 1 for an intake screening example. 6 Physical exam should include palpation of the masseter, temporalis, and sternocleidomastoid muscles evaluating for muscle hypertrophy[practicalneurology.com]

  • Accessory Nerve Palsy

    Fig. 1: Lateral and anterior views showing the patient's severe hypertrophy of the right trapezius muscle (left panel), wasting of the sternocleidomastoid muscles, and bilateral[cmaj.ca] The subject's head is spasmodically turned away from the involved muscle, which usually shows hypertrophy.[dartmouth.edu] A physical examination revealed bilateral sternocleidomastoid wasting together with trapezius spasm (dystonia) and hypertrophy ( Fig. 1 ).[cmaj.ca]

  • Patterson Pseudoleprechaunism Syndrome

    […] atrophy Tibialis atrophy Rectus femoris muscle atrophy Frog-leg posture Type 1 and type 2 muscle fiber minicore regions Sternocleidomastoid amyotrophy Abnormality of muscle[mendelian.co] […] morphology Muscle fiber hypertrophy Internally nucleated skeletal muscle fibers Type 1 muscle fiber atrophy Increased nuchal translucency Neoplasm 3-Methylglutaconic aciduria[mendelian.co] Anodontia Thick nail Breast aplasia Ridged nail Supernumerary ribs Generalized osteosclerosis Breast hypoplasia Supernumerary nipple Nail dysplasia Eosinophilia Generalized limb muscle[mendelian.co]

  • Hereditary Proximal Myopathy with Early Respiratory Failure

    There was wasting of the trapezius, sternocleidomastoid and calf muscles, but each patient had initially bilateral calf hypertrophy (Table 1 ).[bmcneurol.biomedcentral.com] In the U.S. family, we observed characteristic sternocleidomastoid/trapezius muscle weakness and atrophy without scapular winging, and calf hypertrophy that was evident before[bmcneurol.biomedcentral.com] :3, II:4, and II:6) at ages 29 to 37 revealed weakness of neck flexors, pectoralis muscles, wrist and finger extensors and flexors, and to a lesser degree intrinsic hand muscles[bmcneurol.biomedcentral.com]

  • Distal Myopathy with Early Respiratory Muscle Involvement

    There was wasting of the trapezius, sternocleidomastoid and calf muscles, but each patient had initially bilateral calf hypertrophy (Table 1 ).[bmcneurol.biomedcentral.com] In the U.S. family, we observed characteristic sternocleidomastoid/trapezius muscle weakness and atrophy without scapular winging, and calf hypertrophy that was evident before[bmcneurol.biomedcentral.com] :3, II:4, and II:6) at ages 29 to 37 revealed weakness of neck flexors, pectoralis muscles, wrist and finger extensors and flexors, and to a lesser degree intrinsic hand muscles[bmcneurol.biomedcentral.com]

  • Native American Myopathy

    There was wasting of the trapezius, sternocleidomastoid and calf muscles, but each patient had initially bilateral calf hypertrophy (Table 1 ).[bmcneurol.biomedcentral.com] In the U.S. family, we observed characteristic sternocleidomastoid/trapezius muscle weakness and atrophy without scapular winging, and calf hypertrophy that was evident before[bmcneurol.biomedcentral.com] :3, II:4, and II:6) at ages 29 to 37 revealed weakness of neck flexors, pectoralis muscles, wrist and finger extensors and flexors, and to a lesser degree intrinsic hand muscles[bmcneurol.biomedcentral.com]

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