Webster's New World Medical Dictionary

micturition syncope
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measures can include medications and avoiding any
known migraine triggers. Medication that can ease
the pain of a current migraine is also available. See
also 
headache; headache, vascular.
migrainous neuralgia
See 
cluster headache.
miliary aneurysm
A tiny aneurysm. Miliary
aneurysms tend to affect minute arteries in the brain
or in the retina of the eye. They can bleed and lead
to impaired function of the brain or eye. See also
aneurysm
.
miliary tuberculosis
The presence of numer-
ous sites of tuberculosis infection, each of which is
minute, due to dissemination of infected material
through the bloodstream in a process somewhat
like the metastasis of a malignancy.
milk teeth
See 
primary teeth.
mineralocorticoid
A group of hormones that
regulate the balance of water and electrolytes (ions
such as sodium and potassium) in the body. The
mineralocorticoid hormones act on the tubules of
the kidney. The most important mineralocorticoid
hormone is aldosterone.
minimally invasive surgery
A type of surgery
that is done through small incisions through which
instruments and imaging devices are passed; some-
times called laparoscopic surgery. Minimally inva-
sive surgery is performed in many different surgical
specialties. For patients, minimally invasive surgery
has the advantages of a lower rate of blood loss and
other complications, smaller surgical scars, and a
reduced need for pain medication. Patients can usu-
ally leave the hospital and resume normal activity
sooner after minimally invasive surgery than with
conventional open surgery.