En español son más conocidos como "extensiones" o "frotis", de hecho yo nunca había oído hablar de "extendidos".
Intraquirúrgicos significa sencillamente que se realizan durante la operación/intervención quirúrgica.

Diccionario de medicina Mosby.
Frotis (smear): muestra de laboratorio para estudio microscópico preparada mediante extensión de una fina película de tejido (o células) sobre un portaobjetos de vidrio. La muestra puede tratarse con un colorante, un tinte, un reactivo, un disolvente o un agente que favorece la lisis celular.

Dysembrioplastic neuroepithelial tumor: cytological diagnosis by ...
The authors report on a case of DNT diagnosed by the ***intraoperative smear*** cytological technique. We describe the cytological characteristics of smear ...
www.cytojournal.com/pubmed/11813325

Blackwell Synergy: Neuropathol Appl Neurobiol, Vol 0, Issue 0 ... - ***Intraoperative smear preparations*** from the first operation were moderately ... An intraoperative smear showed numerous uniform round cells set against a ...
www.blackwell-synergy.com/ doi/abs/10.1111/j.1365-2990.2005.00692.x

MicroLab 2 -
The stained ***smear preparation*** you will be using most often later can distort the size ... Smear preparation. Obtain a clean slide and transfer drops of cell ...
www.goshen.edu/bio/Biol206/Biol206Labs/Lab2.html


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Note added at 1 hr (2006-03-03 19:07:19 GMT)
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Rhabdoid meningioma: intraoperative diagnosis using smear preparation. A case is presented to highlight the appearance of rhabdoid cells on an ***intraoperative smear preparation*** of a rhabdoid meningioma. ...
www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve& db=PubMed&list_uids=14595799&dopt=Abstract


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Note added at 14 hrs (2006-03-04 08:05:44 GMT)
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Case 12 - Findings
***Smear preparation of a stereotactic biopsy specimen (Giemsa, x20 (Obj.)): *** Glial tumor tissue composed of relatively uniform bipolar cells with regular oval ...
www.med-rz.uni-sb.de/med_fak/ neuropatho/sbdil/case12.html


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Note added at 14 hrs (2006-03-04 08:09:06 GMT)
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http://www3.interscience.wiley.com/cgi-bin/abstract/10656070...
***Rhabdoid meningioma: Intraoperative diagnosis using smear preparation***

Abstract
Tumors with rhabdoid morphology were first described by Beckwith and Palmer in 1978 as aggressive renal tumors in very young children. (...)
Nucleoli are invariably present. While their morphology is well recognized in processed biopsy material, their presence on a smear preparation can be quite startling. A case is presented to highlight the appearance of rhabdoid cells on an intraoperative smear preparation of a rhabdoid meningioma.




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Note added at 14 hrs (2006-03-04 08:12:01 GMT)
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Una apología del diagnóstico citológico sobre material en fresco Jayaram G. ***Method of smear preparation in intraoperative cytology (letter, comment). ***... Kjurkchiev G, Valkov I: Role of touch imprint and core biopsy for ...
www.pgmacline.es/revpatologia/ volumen36/vol36-num1/36-1n06.htm