MRI

Magnetic resonance imaging.

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MRKH syndrome definition
Genetic Home Reference. Mayer-Rokitansky-Kuster-Hauser Syndrome.
MRSA infection
Methicillin-resistant staphylococcus aureus.
MRSI
Magnetic resonance spectroscopic imaging.

MSAFP (maternal serum alpha-fetoprotein)
High with open neural tube defects such as anencephaly and spina bifida (meningomyelocele); and Low with Down syndrome (trisomy 21, an extra chromosome number 21).
MSBP
Munchhausen syndrome by proxy.