A Rare Clinical Presentation With a Difficult Imaging Diagnosis of an Intra-articular Clear Cell Sarcoma of the Knee

Author:

Kawasaki Tomonori1,Ichikawa Jiro2,Imada Hiroki3,Onohara Kojiro4,Torigoe Tomoaki5

Affiliation:

1. Department of Pathology, Saitama Medical University International Medical Center, Saitama

2. Department of Orthopedic Surgery, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Yamanashi

3. Department of Pathology, Saitama Medical Center, Saitama Medical University, Saitama

4. Department of Radiology, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Yamanashi

5. Department of Orthopaedic Oncology & Surgery, Saitama Medical University International Medical Center, Saitama, Japan.

Abstract

Abstract Clear cell sarcoma, a highly aggressive cell sarcoma with melanotic differentiation, typically occurs in the tendon and aponeuroses of the lower extremities and rarely develops in the intra-articular region. Herein, we present an extremely rare case of clear cell sarcoma originating from the intra-articular knee and suspected as benign tumors due to the benign-looking findings on MRI and PET/CT. The image results in our case were completely consistent with a tenosynovial giant cell tumor, resulting in the misdiagnosis. For differential diagnosis, especially malignant melanoma, histopathology, including IHC and FISH, was indispensable.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Radiology, Nuclear Medicine and imaging,General Medicine

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