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CC BY-NC-ND 4.0 · Rev Bras Ortop (Sao Paulo) 2021; 56(05): 675-679
DOI: 10.1055/s-0040-1715517
Relato de Caso
Oncologia

Intra-articular Knee Lipomatous Tumor: Two Similar but Different Cases*

Article in several languages: português | English
Samir Karmali 
1   Departamento de Ortopedia, Hospital Vila Franca de Xira, Vila Franca de Xira, Portugal
,
Daniel Sá da Costa 
1   Departamento de Ortopedia, Hospital Vila Franca de Xira, Vila Franca de Xira, Portugal
2   Departamento de Ortopedia, Hospital CUF Infante Santo, Portugal
,
Rita Carvalho Silva
2   Departamento de Ortopedia, Hospital CUF Infante Santo, Portugal
3   Departamento de Ortopedia, Hospital Beatriz Ângelo, Loures, Portugal
,
João Lacerda
2   Departamento de Ortopedia, Hospital CUF Infante Santo, Portugal
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Abstract

Although lipomatous tumors are common, intra-articular occurrence is exceedingly rare and sparsely described in the literature. Regarding these rare entities, most are benign, progressively growing tumors and often occur in the knee, yet it is crucial to distinguish the less infrequent lipoma arborescens (LA) from the rarer synovial lipoma, as they differ in presentation and pathogenesis. Magnetic resonance imaging is the exam of choice in their assessment and in differential diagnosis, playing a central role nowadays.

Excision and synovectomy, either arthroscopic or by arthrotomy, provide good outcomes with low recurrence rates. By reporting two surgically treated distinct cases of intra-articular lipomatous tumors of the knee, the authors intend to review the literature and discuss their etiology, clinical and imaging aspects as well as treatment approach.

Keywords

knee joint - soft tissue neoplasms - lipoma - synovectomy

∗ Work developed at Hospital CUF Infante Santo, Portugal.




Publication History

Received: 30 April 2020

Accepted: 01 June 2020

Article published online:
25 September 2020

© 2021. Sociedade Brasileira de Ortopedia e Traumatologia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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