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. 2021 Mar 31;58(6):e957-e959.
doi: 10.1055/s-0040-1722594. eCollection 2023 Dec.

Fibroma of the Patellar Tendon Sheath: A New Paradigm

João Boavida  1 , Rui Sousa Grandão  2 , Maria Pia Monjardino  1 , Catarina Quintas  1 , João Pedro Oliveira  1
Affiliations

Fibroma of the Patellar Tendon Sheath: A New Paradigm

João Boavida et al. Rev Bras Ortop (Sao Paulo). .

Abstract

The authors present a case of fibroma of the tendon sheath with intra-articular location in the knee, more specifically in the infrapatellar fat; with this specific location, this is the fourth case described of an entity that rarely affects large joints. Clinical and epidemiological aspects, but especially the imaging findings on magnetic resonance imaging scans, are essential for the differential and definitive diagnosis, which was nevertheless established only after a histological study of the excised mass by miniarthrotomy.

Keywords: fibroma of tendon sheath; intra-articular fibroma; knee; patellar tendon.

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Conflict of interest statement

Conflito de Interesses Os autores declaram não haver conflito de interesses.

Figures

Fig. 1
Fig. 1
Images of the relative isointensity in the sagittal plane on T2 ( a ), T1 ( b ) and axial plane on T2 ( c ).
Fig. 2
Fig. 2
Intraoperative photographs: ( a ) location and clinical appearance; ( b ) pediculated lesion before complete excision; ( c ) macroscopic appearance and measurement of the largest axis, with approximately 4 cm ( d ) Relatively homogeneous intralesional macroscopic aspect.
Fig. 3
Fig. 3
Photomicrography: ( a ) proliferation of fibrohyaline stroma; ( b ) elongated and monotonous fibroblasts; ( c ) surface coated by synovial epithelium.
Fig. 1
Fig. 1
Imagens da relativa isointensidade no plano sagital em T2 ( a ), T1 ( b ), e plano axial em T2 ( c )
Fig. 2
Fig. 2
Fotografias intraoperatórias: ( a ) localização e aspeto clínico; ( b ) lesão pediculada antes da sua excisão completa; c ) aspecto macroscópico e medição do maior eixo, de aproximadamente 4 cm; d ) aspecto macroscópico intralesional relativamente homogêneo.
Fig. 3
Fig. 3
Fotomicrografia: ( a ) proliferação de estroma fibro-hialino; ( b ) fibroblastos alongados e monótonos; ( c ) superfície revestida por epitélio sinovial.
See this image and copyright information in PMC

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