| LOCM | low molecular contrast medium |
|---|---|
| LUMO | lowest unoccupied molecular orbital |
| MGG | May-Grunwald-Giemsa [staining]; molecular and general genetics; mouse gammaglobulin; multinucleated ... |
| ML | Licentiate in Medicine; Licentiate in Midwifery; malignant lymphoma; marked latency; maximum likelih... |
| MO | macroorchidism; manually operated; Master of Obstetrics; Master of Osteopathy; medical officer; mesi... |
| mass stopping power | <physics> The mass stopping power (S/r) of a material for charged particles is the quotient dEs by the product of dl and r, where dEs is the average energy lost by a charged particle of specified energy in traversing a path length dl and r is the density of the medium. (16 Dec 1997) |
|---|---|
| MASS syndrome | <syndrome> A syndrome closely resembling both the Marfan's syndrome and the Barlow syndrome. However, no dislocation of the lenses or aneurysmal changes occur in the aorta, and the mitral valve prolapse is by no means invariable. at present it has been assigned no separate OMIM number, but shares that of the Barlow syndrome. Origin: mitral valve prolapse, aortic anomalies, skeletal changes, and skin changes. (05 Mar 2000) |
| parotid gland mass | <radiology> Pleomorphic adenoma, sialocele, adenoid cystic carcinoma, adenocarcinoma, lymphoma, lymph node, abscess, metastasis (12 Dec 1998) |
| middle ear mass | <radiology> Glomus tumour (multiple in 10%; 8% malignant), glomus tympanicum, from cochlear promontory, seldom erodes bone, glomus jugulare, invasion of middle ear from below, destruction of bony roof of jugular fossa and bony spur separating vein from carotid artery, abberant carotid artery (no bony margin), enlarged jugular bulb (dehiscent bony covering), cholesteatoma, rhabdomyosarcoma (orbit greater than nasopharynx greater than ear), adenocarcinoma (rare) (12 Dec 1998) |
| middle mediastinal mass | <radiology> Mnemonic: not VD, 90% malignant, Nodes, tumour (metastasis, lymphoma/leukaemia), infection, inhalational disease, Castleman disease, Tumour, primary lung, trachea, oesophagus carcinoma, Vascular, aneurysm, haematoma, Duplication cyst, bronchogenic, enteric, neurenteric (12 Dec 1998) |
| molar mass | See: molecular weight. (05 Mar 2000) |
| pill mass | The mixture of drug(s), excipients, diluents and binders with a suitable amount of liquid to form a plastic mass which can be rolled into a long rod and cut into the appropriate number of units for pills to be rolled from. Synonym: pill mass. (05 Mar 2000) |
| pilular mass | The mixture of drug(s), excipients, diluents and binders with a suitable amount of liquid to form a plastic mass which can be rolled into a long rod and cut into the appropriate number of units for pills to be rolled from. Synonym: pill mass. (05 Mar 2000) |
| complex liver mass in kids | <radiology> Epithelial, FNH (uncommon, F greater than M), hepatic adenoma (uncommon, F greater than M), hepatoma (increased aFP in 90%), hepatoblastoma (increased aFP, less than 2 years of age), mesenchymal, hamartoma, cavernous haemangioma, haemangioendothelioma, embryonal rhabdomyosarcoma (obstructs common bile duct; less than 5 years of age), undifferentiated sarcoma, teratoma, abscess / haematoma / complicated cyst (12 Dec 1998) |
| critical mass | <chemistry, radiobiology> The minimum amount of mass of a combination of radioactive substances needed for the substances to generate and lose an exactly balanced number of neutrons to make a chain reaction which will keep going by itself. (09 Oct 1997) |
| posterior mediastinal mass | <radiology> Mnemonic: HALOVEEN, haematoma, abscess, lymph nodexs, osteophyte, vertebral (metastasis, plasmacytoma), extramedullary haematopoesis, oesophagus, neurogenic (12 Dec 1998) |
| cystic pelvic mass | <radiology> Physiologic ovarian cyst, The Big Three (ectopic, PID, endometriosis), ovarian neoplasm, nongynecologic mass (12 Dec 1998) |
| cystic sellar mass | <radiology> Arachnoid cyst, cystic craniopharyngioma, dermoid / epidermoid (12 Dec 1998) |
| sclerotic cemental mass | Benign fibro-osseous jaw lesions of unknown aetiology, occurring predominantly in middle-aged black females, which present as large painless radiopaque masses usually involving several quadrants of the jaw. Synonym: florid osseous dysplasia, cemental dysplasia. (05 Mar 2000) |
| solid renal mass | <radiology> MALIGNANT until proven otherwise!, renal cell carcinoma (85%), other malignancy (10%), renal sarcoma, lymphoma, transitional cell carcinoma, metastases, benign mass (5%), oncocytoma, angiomyolipoma (fat present), fibroma (12 Dec 1998) |