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The Korean Journal of Pathology 2011;45(Suppl 1): S58-S61.
doi: https://doi.org/10.4132/KoreanJPathol.2011.45.S1.S58
Angiomyomatous Hamartoma of Popliteal Lymph Nodes Occurring in Association with Diffuse Pigmented Villonodular Synovitis of Knee.
Hyun Soo Kim, Ki Yong Na, Jae Hoon Lee, Nam Su Cho, Gou Young Kim, Sung Jig Lim
1Department of Pathology, Kyung Hee University School of Medicine, Seoul, Korea. sungjig@khu.ac.kr
2Department of Orthopaedic Surgery, Kyung Hee University School of Medicine, Seoul, Korea.
We report the first case of an angiomyomatous hamartoma (AH) of the popliteal lymph nodes (LNs) occurring in association with diffuse pigmented villonodular synovitis (PVNS) of the knee. AH is a rare benign vascular disease with a predisposition for the LNs of the inguinal region. Twenty-five cases of AH have been reported to date; however, the precise pathogenesis is still undetermined. In the present case, an open synovectomy revealed two of three popliteal LNs in close proximity to the extra-articular component of diffuse PVNS. These LNs demonstrated irregularly distributed thick-walled blood vessels in the hilum. These vessels extended into the medulla and cortex and were associated with haphazardly arranged smooth muscle cells in the sclerotic stroma. These findings are compatible with an AH. Our observations raise the possibility that AH of the popliteal LNs may represent an abnormal proliferative reaction against the inflammatory process caused by PVNS of the knee.
Key Words: Angiomyoma; Hamartoma; Popliteal; Lymph nodes; Synovitis, pigmented villonodular