Document Detail

Use of CT simulation for treatment of cervical cancer to assess the adequacy of lymph node coverage of conventional pelvic fields based on bony landmarks.
MedLine Citation:
PMID:  16198505     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To assess the adequacy of nodal coverage of "conventional" pelvic radiation fields for carcinoma of the cervix, with contoured pelvic vessels on simulation computed tomography (CT) as surrogates for lymph node location. METHODS AND MATERIALS: Pelvic arteries were contoured on non-contrast-enhanced CT simulation images of 43 patients with cervix cancer, FIGO Stages I-III. Vessel contours were hidden, and conventional pelvic fields were outlined: (1) anterior/posterior fields (AP): superior border, L5-S1 interspace; inferior border, obturator foramina; lateral border, 2 centimeters lateral to pelvic brim. (2) Lateral fields (LAT): Anterior border, symphysis pubis; posterior border, S2-S3 interspace. Distances were measured between the following: (1) bifurcation of the common iliac artery and superior border, (2) external iliac artery and lateral border of the AP field, and (3) external iliac artery and anterior border of the LAT field. The distances were considered as "inadequate" if <15 mm, "adequate" if 15-20 mm, and "generous" if >20 mm. RESULTS: Superiorly, 34 patients (79.1%) had inadequate coverage. On the AP, margins were generous in 19 (44.2%), but inadequate in 9 (20.9%). On the LAT, margins were inadequate in 30 (69.8%) patients. Overall, 41 (95.4%, CI, 84.2%-99.4%) patients had at least 1 inadequate margin, the majority located superiorly. Twenty-four (55.8%; CI, 39.9%-70.9%) patients had at least 1 generous margin, the majority located laterally on the AP field. CONCLUSION: Conventional pelvic fields based on bony landmarks do not provide optimal lymph node coverage in a substantial proportion of patients and may include excess normal tissue in some. CT simulation with vessel contouring as a surrogate for lymph node localization provides more precise and individualized field delineation.
Marisa H Finlay; Ida Ackerman; Romeo G Tirona; Paul Hamilton; Lisa Barbera; Gillian Thomas
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Publication Detail:
Type:  Journal Article     Date:  2005-09-29
Journal Detail:
Title:  International journal of radiation oncology, biology, physics     Volume:  64     ISSN:  0360-3016     ISO Abbreviation:  Int. J. Radiat. Oncol. Biol. Phys.     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2005-12-26     Completed Date:  2006-03-23     Revised Date:  2006-09-14    
Medline Journal Info:
Nlm Unique ID:  7603616     Medline TA:  Int J Radiat Oncol Biol Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  205-9     Citation Subset:  IM    
Department of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, Sunnybrook, Toronto, Ontario, Canada.
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MeSH Terms
Feasibility Studies
Iliac Artery / radiography
Lymph Nodes / radiography*
Pelvic Bones / radiography
Radiotherapy Planning, Computer-Assisted / methods*
Tomography, X-Ray Computed*
Uterine Cervical Neoplasms / blood supply,  radiography*,  radiotherapy*
Comment In:
Int J Radiat Oncol Biol Phys. 2006 Aug 1;65(5):1594; author reply 1594   [PMID:  16863938 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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