PurposeThis study was done to investigate X-ray, computed tomography (CT) and magnetic resonance (MR) imaging features of recurrence in giant cell tumour of bone (GCTB) and to evaluate risk factors.Materials and methodsMedical records and imaging data were reviewed for 55 cases of recurrent GCTB. All images were reviewed retrospectively and independently by two radiologists experienced in skeletal musculature. The common radiological findings; factors related to tumour recurrence such as gender, age, location; pathological fracture, Campanacci grading and surgical procedure were analysed by nonparametric test (Mann-Whitney U test for two independent samples test and Kruskal-Wallis H test for multiple independent samples test). p values <0.05 were considered to indicate a statistically significant difference.ResultsThe imaging features of recurrent GCTB were as follows: osteolytic destruction or bone resorption of graft bone or around the polymethylmethacrylate (PMMA), soft tissue mass formation and expansile change. Tumour parenchyma showed markedly heterogeneous enhancement, except for necrotic cystic cavities, on contrast-enhanced MR images. Wide resection had a smaller (p=0.031) risk of local recurrence than did intralesional curettage. There was no statistical significance in gender, age, location, pathological fracture and Campanacci staging (p>0.05).ConclusionsThe risk of recurrence in GCTB was influenced by the type of surgery and adjuvants. Bone transformaresorption, soft tissue mass formation and aggravated expansile change are reliable signs of recurrence on imaging.RiassuntoObiettivoQuesto studio è stato condotto per valutare le caratteristiche radiografiche, di tomografia computerizzata (TC) e di risonanza magnetica (RM) della recidiva del tumore osseo a cellule giganti (GCTB) e valutarne i fattori di rischio.Materiali e metodiSono state riesaminate le cartelle cliniche e le indagini radiologiche di 55 casi di GCTB recidivante. Tutte le immagini sono state valutate retrospettivamente ed in maniera indipendente da due radiologi esperti in radiologia muscolo-scheletrica. I rilievi radiologici ed i fattori correlati alla recidiva tumorale come sesso, età, sede, presenza di frattura patologica, classificazione di Campanacci e procedura chirurgica sono stato analizzate mediante test non parametrici (test U di Mann-Whitney U e test H di Kruskal-Wallis). Valori di p<0,05 sono stati considerati statisticamente significativi.RisultatiLe principali caratteristiche radiologiche del GCTB recidivante sono risultate essere: distruzione osteolitica, riassorbimento dell’innesto osseo o in adiacenza al polimetilmetacrilato (PMMA), insorgenza di massa nei tessuti molli e comparsa di formazione espansiva. All’indagine RM il tessuto tumorale ha mostrato enhancement marcatamente eterogeneo, ad eccezione per le cavità cistiche necrotiche. Le resezioni radicali hanno avuto un minor rischio (p=0.031) di recidiva locale rispetto al curettage intralesionale. Non si è evidenziata differenza statisticamente significativa per quanto concerne sesso, età, sede, presenza di frattura patologica e classificazione di Campanacci (p>0.05).ConclusioniIl rischio di recidiva del GCTB è influenzato dal tipo di chirurgia e dalla presenza di innesti. Riassorbimento osseo, insorgenza di massa nei tessuti molli e comparsa di formazioni espansive sono segni radiologici affidabili di recidiva.
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