| MASH | mobile Army surgical hospital; multiple automated sample harvester |
|---|---|
| MASU | mobile Army surgical unit |
| MS | Maffuci syndrome; maladjustment score; mandibular series; Marfan syndrome; Marie-Strumpell [syndrome... |
| NSABP | National Surgical Adjuvant Breast Project |
| PSH | past surgical history; postspinal headache |