Soft tissue metastasis of thyroid carcinoma in the knee region mimicking a paraarticular inflammatory lesion

Archives of Orthopaedic and Trauma Surgery
Torsten PrietzelThomas Aigner

Abstract

We report a case of a 57-year-old male patient presenting with a painful mass in the popliteal fossa of the left knee, while the X-ray being unremarkable, MRI suggested a paraarticular lesion such as an inflamed paraarticular ganglion. A biopsy showed a poorly differentiated metastasis of a papillary thyroid carcinoma, the patient had been operated on 8 years ago. This case emphasizes that in patients with malignancies such as papillary thyroid carcinomas long-term courses (over years) with several phases of tumor spread occur finally leading to filiae in any location. Thus, in such patients, a metastatic lesion even in unusual places such as the periarticular soft tissue should be included in the differential diagnosis.

References

Sep 1, 1996·CA: a Cancer Journal for Clinicians·R F GagelD L Callender
Oct 18, 2000·Archives of Pathology & Laboratory Medicine·S K TickooJ Rosai
May 27, 2006·European Journal of Endocrinology·Furio PaciniUNKNOWN European Thyroid Cancer Taskforce

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Citations

Aug 31, 2017·Archives of Orthopaedic and Trauma Surgery·Juan Pretell-MazziniShai Shemesh

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