Lipoma arborescens de joelho em paciente com espondilite anquilosante: relato de caso e revisão da literatura / Lipoma arborescens of the knee in a patient with ankylosing spondylitis: case report and literature review

RESUMOLipoma arborescens (LA) é definido como uma proliferação vilosa lipomatosa da membrana sinovial com substituição difusa do tecido sinovial por células gordurosas maduras. A lesão é muito rara, envolve a articulação do joelho (região suprapatelar) e se associa a doenças articulares degenerativas. Descrevemos o caso de um paciente de sexo masculino, portador de espondilite anquilosante com quadro de monoartrite de joelho direito e aumento de volume importante na região suprapatelar. O diagnóstico de lipoma arborescens foi confirmado a partir da ressonância magnética do joelho direito.

ABSTRACTLipoma arborescens (LA) is defined as a villous lipomatous proliferation of the synovial membrane with diffuse substitution of the synovial tissue by mature fat cells. The injury is very rare, involving the knee joint (suprapatellar region) and is associated with degenerative joint disease. We describe the case of a male patient, suffering from ankylosing spondylitis with monoarthritis of the right knee and swelling in suprapatellar region important. The diagnosis of lipoma arborescens was confirmed from the MRI of the right knee.

Sinovitis villonodular pigmentada focal como diagnóstico diferencial de monoartritis de rodilla / Focal pigmented villonodular sinovitis in the differential diagnosis of knee monoarthritis

La sinovitis villonodular pigmentada (SVNP) es una proliferación sinovial benigna, asociada a depósitos de hemosiderina, que se origina en las articulaciones, bursas o vainas tendinosas. La articulación más afectada es la rodilla (80% de los casos) y menos frecuente hombro, codos y tobillos. La resonancia magnética, permite la detección de la SVNP y el estudio histopatológico hace la confirmación del diagnóstico. Describimos el caso de una paciente con monoartritis de rodilla izquierda que, después de múltiples estudios, la biopsia fue compatible con sinovitis villonodular pigmentada

Pigmented villonodular synovitis (PVNS) is a benign synovial proliferation associated with hemosiderin deposits, which originates in joints, bursa or tendon sheaths. The knee is the joint most commonly affected (80% of cases), and less frequently it can affect the shoulder, ankle and elbow. Magnetic Resonance Imaging (MRI) is used to detect PVNS, and histological analysis is used to confirm the diagnosis. We describe the case of a patient with monoarthritis of the left knee, who after multiple biopsy studies, it was found to be compatible with PVNS.