This article contains a list of commonly used medical abbreviations and acronyms that start with the letter M and may be encountered in medicine and radiology (please keep the main list and any sublists in alphabetic order).
A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z - misc
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M
male
marginal artery
mega- (SI prefix for 106)
metastatic (TNM system)
methionine (single letter amino acid code)
mitotic (phase)
molar (=mols/L)
m: milli- (SI prefix for 10-3)
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M1-M4
segments in the Alberta stroke program early CT score (ASPECTS), also including M5-6
segments of middle cerebral artery
MA: mitral annulus
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MAC
membrane attack complex
MACI: matrix-induced autologous chondrocyte implantation
MAG: magnification
MAG-3: mercaptoacetyltriglycine
MAGiC: magnetic resonance image compilation (GE)
MAHA: microangiopathic hemolytic anemia
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MAI
miscarriage after infertility
MAL: mid axillary line
MALA: metformin-associated lactic acidosis
MAM: mammogram
MAMMO: mammogram
MAO: monoamine oxidase
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MAP
mean arterial pressure
MAR: metal artifact reduction
mAs: milliampere-seconds
MAV: mechanical aortic valve
MAVRIC: multiacquisition variable-resonance image combination (GE)
MAVRIC-SL: multiacquisition variable-resonance image combination
Maxfax: maxillofacial surgery/surgeon
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MB
bachelor of medicine
megabyte
multiband (imaging)
myoglobin
MBA: motorbike accident
MBBS: bachelor of medicine and bachelor of surgery
MBC: motorbike collision
mBC: metastatic breast cancer
MBL: monoclonal B-cell lymphoma
MBq: megabecquerel
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MC
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M/C
motorcycle
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MCA
MCG/mcg: microgram (preferred to μg in medical notes)
MCI: mass casualty incident
mCi: millicurie
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MCL
medial collateral ligament (of the elbow)
medial collateral ligament (of the knee)
midclavicular line
mCRPC: metastatic castration-resistant prostate cancer
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MCS
microscopy, culture, and sensitivity
MCV: middle cardiac vein
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MD
doctor of medicine (Latin: medicinae doctor)
managing director
medical director
movement disorder
Md: mendelevium
MDA criteria: MD Anderson criteria for assessing response of bone metastases to treatment
MDCT: multidetector CT
MDI: multidirectional instability (of shoulder)
MD-IPMN: main duct type intraductal papillary mucinous neoplasm
MDM: multidisciplinary (team) meeting
MDMA: 3,4-methylenedioxymethamphetamine
MDP: methylene-diphosphonate
MDR-TB: multidrug-resistant tuberculosis
MDT: multidisciplinary team
MDTM: multidisciplinary team meeting
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ME
medical examiner
MEDIC: multiecho data image combination (Siemens)
MEDS: medication
MEG: megalencephaly
MELAS: mitochondrial encephalopathy with lactic acidosis and stroke-like episodes
MELD (score): model of end-stage liver disease
MEP: maximum expiratory pressure
MERGE: multiple-echo recombined gradient echo (GE)
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MESA
microsurgical epididymal sperm aspiration
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MET
medical emergency team
medical expulsive therapy (ureteric calculi)
metabolic equivalent
metastasis
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Met
metastasis
methionine
MetHb: methemoglobin
Mets: metastases
MeVO: medium vessel occlusion
MF: middle finger
MFC: medial femoral condyle
MFFE: multiecho fast field echo (Philips)
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MG
middle grade (UK physician grade)
milligram
Mg: magnesium
mGy: milligray
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MGUS
MH: medical history (or M/H)
MHC: major histocompatibility complex
MHV: middle hepatic vein
MHz: megahertz
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MI
MIBG: metaiodobenzylguanidine
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Micro
microbiology
microscopy
SI prefix for 10-6
MIES: mask induced exhaustion syndrome
Min: minute
MinIP: minimum intensity projection
MINOCA: myocardial infarction with non-obstructive coronary arteries
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MIP
maximum inspiratory pressure
MIS-C: multisystem inflammatory syndrome in children
MISME: multiple inherited schwannomas, meningiomas, ependymomas
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ML
mediolateral
mobile lipids (MRS)
mL: milliliter
ml: milliliter
MLA: minimal lumen area
MLC: multileaf collimator
MLD: midline deviation
MLO: mediolateral oblique
MLS: midline shift
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MM
mm: millimeter
M&M: morbidity and mortality
MMC: myelomeningocele
MMD: moyamoya disease
mmHg: millimeters of mercury
M-mode: motion mode (ultrasound)
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MMR
MMS: moyamoya syndrome
MMSE: mini mental status exam
MMUS: magnetomotive ultrasound
Mn: manganese
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MND
mild neurocognitive disorder (in the context of HIV)
MNG: multinodular goiter
MNGIE: mitochondrial neurogastrointestinal encephalomyopathy
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MO
medical officer
modus operandi
morphine
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Mo
month
MoCA: Montreal cognitive assessment
Mol: mole (SI unit of quantity of substance)
MOGAD: myelin oligodendrocyte glycoprotein antibody-associated disease
MOTSA: multiple overlapping thin slab acquisition
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MP
middle phalanx
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MPA
MPD: main pancreatic duct
MPO: myeloperoxidase
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MPP
MPV: main portal vein
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MR
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MRCP
Member(ship) of the Royal College of Physicians (UK)
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MRE
mrem: millirem
MRF: mesorectal fascia
MRN: medical record number
mRNA: messenger ribonucleic acid
MRPA: magnetic resonance pulmonary angiography
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MRS
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MS
master of surgery
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MSA
muscle specific actin
MSD: mean sac diameter
MSE: mental status exam
MSH: melanocyte-stimulating hormone
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MSK
MSM: men who have sex with men
MSSA: methicillin-susceptible/sensitive Staphylococcus aureus
MSSU: midstream sample of urine
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MSU
midstream urine
mSv: millisievert
MT: metatarsal
MTA score: medial temporal lobe atrophy score
MTOP: medical termination of pregnancy
MTT: mean transit time
MTX: methotrexate
MUA: manipulation under anesthesia
Multips: multipara
MV: mitral valve
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MVA
manual vacuum aspiration
motor vehicle accident
MVC: motor vehicle crash (or collision)
MVV: maximal voluntary ventilation
MWA: microwave ablation
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Mx
management
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MZ
monozygote