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Stereotactic Radiosurgery for Gynecologic Cancer
Published on: April 17, 2012
Mapping patterns of nodal metastases in seminoma: rethinking radiotherapy fields
Jonathan J Paly1, Jason A Efstathiou, Sandeep S Hedgire
1Department of Radiation Oncology, Massachusetts General Hospital, Boston, MA 02114, USA.
Background And Purpose:
To analyze the location of metastatic lymph nodes in seminoma patients relative to vascular and bony anatomy and conventional radiation fields.
Materials And Methods:
Cross-sectional scans of 90 seminoma patients with infradiaphragmatic adenopathy were analyzed. The position of each node respective to vascular anatomy was transferred to a standardized template. Conventional radiation fields were overlaid on the template and locations of metastatic nodes were assessed.
Results:
One hundred and forty-five nodes were radiographically positive. Eighty-four percent, 9%, and 7% of nodes were located in the para-aortic, common iliac, and pelvic regions, respectively. Ninety-nine percent of nodes were within a 2.5 cm lateral and 2.1cm anterior expansion of the aorta inferior to T12/L1. No radiographically positive nodes were identified within the renal hilum or superior to L1 in left-sided seminomas. For right-sided seminomas, no radiographically positive nodes were superior to L2. Three percent of all radiographically positive nodes would have been located outside of conventional and modified fields.
Conclusions:
Infradiaphragmatic nodal metastases from a contemporary cohort of seminoma patients localized to a smaller area than is targeted by conventional radiation fields. Modified treatment fields based on vascular, rather than bony, anatomy are smaller and may allow for a significant decrease in normal tissue irradiation and toxicity.
Insights
Metastatic lymph nodes in seminoma patients are located in a smaller area than conventional radiation fields target. Vascular-based radiation fields may reduce normal tissue toxicity in seminoma treatment.
Area of Science:
- Oncology
- Radiation Oncology
- Medical Imaging
Background:
- Seminoma is a type of testicular cancer.
- Lymph node metastasis is a key factor in seminoma staging and treatment.
- Understanding the precise location of metastatic lymph nodes is crucial for effective radiation therapy planning.
Purpose of the Study:
- To analyze the location of metastatic lymph nodes in seminoma patients.
- To compare the location of these nodes relative to vascular and bony anatomy.
- To evaluate the coverage of metastatic nodes by conventional radiation fields.
Main Methods:
- Analysis of cross-sectional scans from 90 seminoma patients with infradiaphragmatic adenopathy.
- Mapping of metastatic lymph node positions relative to vascular anatomy on a standardized template.
- Overlaying conventional radiation fields onto the template to assess node coverage.
Main Results:
- 145 radiographically positive lymph nodes were identified.
- 84% of nodes were in the para-aortic region, 9% in the common iliac, and 7% in the pelvic region.
- 99% of nodes were within a limited expansion of the aorta, suggesting a smaller target area than conventional fields.
Conclusions:
- Infradiaphragmatic nodal metastases in seminoma patients are confined to a smaller region than conventional radiation fields.
- Modified radiation fields based on vascular anatomy could be smaller.
- This approach may significantly decrease normal tissue irradiation and associated toxicity.
