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5 Possible Causes for Hypertrophy of the Sternocleidomastoid Muscle

  • 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]

  • 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]

  • 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]

  • 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] A physical examination revealed bilateral sternocleidomastoid wasting together with trapezius spasm (dystonia) and hypertrophy ( Fig. 1 ).[cmaj.ca] These unique clinical images illustrate the coexistence of hypertrophy and atrophy of muscles associated with bilateral neuropathy of the spinal accessory nerves.[cmaj.ca]

  • 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]

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