EEFOIIE: tlicx d i s w w r y iin(1 stiiiid~irtliziitioii of serologiciil a~i d skin tvsts, tlir pre-opcwiti\ (1 diagnosis of Iiydiitid diseiiw was niiicli less ;iwnr;ite tliii~i it is toclay. A t tlic1 M\lrll)oiirnt* Hospitiil, i i i a period of f i f t r t b i i years immc~diatc~ly prrc*c~ding the nsv of tliesr tests, tlicl (war in pre-opwativc diagnosis i n 224 piiticvits with this c1isc;iw was .5L33;5 . Among 133 patieuts who wwe fnlly investigatrd Iwtwern 1!)34 and 1930 tlie error in diiignosis \\Tiis only 4.7v . I h r i n g this period thc.re W T C~ 17 patients who f o r varioiis reasons were not so iiiwstigzitcd, and in i i o i i (~ of tlirse was tlie condition diagnosed.Ikfore t h coniplemc~nt fixation test \viiS tlioronghly studied arid staiitkirdiztd by S. Ir. I h i r l e f " i n 1922, tlic1 only I i~b o~~t o r y tests carried oiit I i c w were tliv microswpic c~siiniiiiatioii of Iiptlatid matvrial obtained morel or less fortiiitoiisly iind tlic1 inwstigiitioii of tliv Illood for oosinopliilia.dltlioiigli tlw discowry of lziniiiiii ted nirml)ranc~, scwliws or hooklets i n tlisclizirgrs from the 1)iiti(~1it iiiiike t h r diagiiosis certain, they iirr foiiiitl so~ncwliat iiifrrqiicwtly. Xoncx tlie loss, they shoiild be soiiglit in tlica f w r s wIi(mxc~r tlic symptoms siigg:.rst tlw rii1)tiire of a cyst into tlic biliary passagrs. Tlic~y sliould not I,e owr1ooIwd in the. spiitiim, iii s~~ec.iniriis of piis and i n tlir iiriiie. C ) c~c i~~i~~i :~l l y i i fiiiid obtiiiiid by aspiration rows to I)(. of hydi~tid origin, biit dingnostic piirictiire of ii siisptwted liydatid cyst is contritindicated 1)c~aiise of tlic risk of so~-ing fnrtlic~ cysts. particularly in tlie peritoneiini and 1 i i i 1~~1 i l i 1 t~~e , iIIid, i n tlie c i i w of cysts of the Iiiiig, Iwcaiise of the danger of cii1isiIig riiptiire into a bronchus ;ind iispliysial death. Serious gencval allchrgic symptoms may occiir following piinc*tnre, but tliese respond to tlie injedioii of adrenalin. Hydatid fluid, ilpitrt from the presence of hooklets or scolices, may be rcwognized by its cle;~r limpid appearance, its small content of coagulable protein and
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