Webster's New World Medical Dictionary

myoclonus
The shock-like, involunatary con-
traction of a muscle. See also 
myoclonic twitch.
myofascial pain syndrome
A condition that is
characterized by chronic pain in the muscle tissues
and is similar to fibromyalgia. Abbreviated MPS. MPS
is sometimes the aftermath of injury. Pain medication,
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myofascial pain syndrome
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anti-inflammatory medication, and therapies aimed
at relaxing the muscle tissues (such as massage, chi-
ropractic, and some forms of acupuncture) have
been reported as beneficial. See also 
fibromyalgia.
myoglobin
The pigment in muscle that carries
oxygen.
myoma
A tumor of muscle. Myoma can refer
specifically to a benign tumor of uterine muscle,
also called a leiomyoma or a fibroid.
myomectomy
Surgery to remove a fibroid from
the uterus.
myometrium
The muscular outer layer of the
uterus.
myopathic pseudo-obstruction
See 
pseudo-
obstruction, myopathic.
myopathy
Any and all diseases of muscle.
myopathy, mitochondrial
See 
MELAS syndrome.
myopia
Nearsightedness, the inability to see dis-
tant objects well. Myopia can be caused by either a
longer-than-normal eyeball or a condition that pre-
vents light rays from focusing on the retina. Most
forms of myopia can be managed with corrective
lenses. Surgery is available to permanently correct
some forms of myopia.
myositis
Inflammation of muscle tissue. There
are many causes of myositis, including injury, med-
ications, and diseases, such as dermatomyositis.
Myositis may require no treatment, stopping med-
ications, or treatment of an underlying disease, if
present.