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Quantitative SPECT/CT for differentiating between enchondroma and grade I chondrosarcoma.

Woo Hee Choi1, Eun Ji Han2, Ki Bong Chang3

  • 1Division of Nuclear Medicine, Department of Radiology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.

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Summary

Quantitative single photon emission computed tomography (SPECT)/computed tomography (CT) can help differentiate enchondromas from low-grade chondrosarcomas. This imaging technique shows potential for improving diagnosis of central chondroid tumors.

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Area of Science:

  • Orthopedic oncology
  • Radiology
  • Nuclear medicine

Background:

  • Differentiating central chondroid tumors like enchondromas and chondrosarcomas is clinically significant but challenging due to their overlapping features.
  • Accurate diagnosis is crucial for appropriate patient management and treatment planning.

Purpose of the Study:

  • To assess the effectiveness of quantitative single photon emission computed tomography (SPECT)/computed tomography (CT) in distinguishing between enchondromas and grade I chondrosarcomas.
  • To evaluate imaging metrics such as tumor volume, SUVmean, and SUVmax for diagnostic accuracy.

Main Methods:

  • Retrospective review of SPECT/CT images from 34 patients with enchondromas or grade I chondrosarcomas in long bones.
  • Calculation of tumor volume, mean standardized uptake value (SUVmean), and maximum standardized uptake value (SUVmax) from SPECT/CT data.
  • Analysis of clinical and radiological data, including age and tumor size.

Main Results:

  • The chondrosarcoma group exhibited significantly larger tumor volumes and higher SUVmean and SUVmax compared to the enchondroma group.
  • Tumor volume, SUVmean, and SUVmax showed areas under the receiver-operating characteristic curve (AUCs) of 0.727, 0.757, and 0.875, respectively.
  • SUVmax demonstrated superior diagnostic performance (AUC 0.875) compared to SUVmean (AUC 0.757), with a sensitivity of 86% and specificity of 75% at a cutoff of 15.6.

Conclusions:

  • Quantitative SPECT/CT parameters, particularly SUVmax, show promise as a non-invasive tool for differentiating grade I chondrosarcomas from enchondromas.
  • This imaging approach may aid clinicians and radiologists in the diagnostic workup of central chondroid tumors.
  • Further validation in larger cohorts is warranted to establish quantitative SPECT/CT as a standard diagnostic method.