Pectoral muscle atrophy

Introduction Muscle atrophy refers to the reduction of skeletal muscle volume, which may be an important symptom and sign of many neuromuscular diseases due to the thinning or disappearance of muscle fibers. Pectoral muscle atrophy is one of the manifestations, mainly dystrophic muscles such as sternocleidomastoid muscle, pectoralis major muscle, and scapular muscle. The muscle volume is smaller than normal, and the muscle fibers become thinner or even disappear.

Cause

Common causes of neurogenic muscle atrophy are disuse, dystrophies, ischemia, and poisoning. Anterior horn lesions, nerve roots, nerve plexus, peripheral nerve lesions, etc. can cause conduction disturbance of nerve excitation impulse, the acetylcholine released from the distal part is reduced, the sympathetic neurotrophic effect is weakened, and some muscle fibers are disused, resulting in waste muscle. Shrinking.

an examination

Related inspection

Chest flat electromyogram

One side of the sternocleidomastoid muscle condensate and the trapezius muscle atrophy, bilateral sternocleidomastoid muscle atrophy with systemic muscle atrophy, difficulty in getting started, early baldness, gonad atrophy, one side of the pectoralis major muscle atrophy, without other Muscle and nervous system symptoms; bilateral scapular muscle atrophy, acute history, no paresthesia and local tenderness, bilateral scapular muscle atrophy, with separation of upper limbs and/or chest wall.

Clinical examination:

1. Determination of serum enzyme concentration;

2. Blood biochemistry and electrolyte determination;

3. X-ray, CT, MRl and other imaging examinations;

4. Electromyography examination;

5. Muscle tissue biopsy, etc.

Differential diagnosis

Myocardium is gray and relaxed: it is a kind of myocardial damage, which may be related to immune myocardial damage after viral infection, and is generally seen in ultrasound examination of dilated cardiomyopathy. Can be used as a differential diagnosis with other cardiomyopathy.

Thoracic collapse: One side of the thoracic collapse can be caused by empyema or pleurisy, extensive pleural thickening adhesions and contractions, atelectasis, pulmonary fibrosis, chronic fibrotic tuberculosis, chronic lung suppuration and other diseases.

A peanut-sized mass at the lateral margin of the pectoralis major: one of the clinical manifestations of breast cancer. Mammary of accessory mamma refers to a cancer that occurs in the accessory breast, which occurs mostly in the temporal region. The rare sites are the subclavian region, the abdomen, and the vulva region. Wang Faheng (1993) reported 4 cases of paraneoplastic breast cancer, including nipples, areola, and mammary glands. There are also only nipples, and some have lactation.

One side of the sternocleidomastoid muscle condensation and trapezius muscle atrophy; bilateral sternocleidomastoid muscle atrophy, accompanied by systemic muscle atrophy, difficulty in getting started, early baldness, gonadal atrophy; one side of the pectoralis major muscle atrophy, without Other muscle and neurological symptoms; bilateral scapular muscle atrophy, acute history, no paresthesia and local tenderness; bilateral scapular muscle atrophy with bilateral upper limbs and/or chest wall sensory separation

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