Abstract
Purpose
Aim of the study is to demonstrate the main role of magnetic resonance imaging in the identification and characterization of lipomatous lesions of the head and neck.
Materials and methods
CT and MRI findings of 78 patients (43 male, 35 female) aged 12–80 (mean 47.5) years surgically treated for lipomatous lesions of the head and neck region between January 1995 and June 2005 were retrospectively analysed and correlated with the histological results.
Results
On CT images, lipomas and fibrolipomas appeared as smooth (38/50 cases) or lobulated (12/50 cases) well-defined masses associated with moderate displacement of surrounding tissues; tumours had high signal intensity on MR T1-weighted images, with relative decreasing signal on T2-weighted images. Infiltrating lipomas appeared as expansile ill-defined masses with heterogeneous signal. Angiolipomas showed a characteristic contrast enhancement on both CT and MRI. In one case of sialolipoma, the lesion appeared markedly heterogeneous in signal. MR and CT images of Madelung’s disease showed multiple symmetrical lipomatous masses involving the neck region. Intraosseous fatty lesions appeared as well-defined hypodense masses sometimes associated with cortical expansion and disruption.
Conclusions
Both CT and MRI exams are useful for detecting lipomatous lesions. MRI, however, is more accurate in the evaluation of their extent and in the characterisation of uncommon lipomatous lesions of the head and neck, and intravenous administration of gadolinium better depicts the margins of the tumour and its vascularisation.
Riassunto
Obiettivo
Lo scopo del lavoro è dimostrare il ruolo primario della risonanza magnetica nell’identificazione e nella caratterizzazione dei lipomi della regione testa-collo.
Materiali e metodi
Gli esami di tomografia computerizzata e risonanza magnetica di 78 pazienti (43 M, 35 F) di età compresa tra i 12 e gli 80 anni (media: 47,5), sottoposti ad intervento chirurgico per l’asportazione di lipomi del distretto testa-collo tra gennaio 1995 e giugno del 2005, sono stati valutati retrospettivamente e correlati successivamente ai risultati dellesame istologico.
Risultati
Nelle immagini di tomografia computerizzata i lipomi ed i fibrolipomi appaiono come masse ben definite con margini lisci (38/50 casi) o lobulati (12/50 casi) associate, con modesta dislocazione dei tessuti circostanti; le lesioni appaiono iperintense nelle immagini di risonanza magnetica ottenute con sequenze T1-pesate con riduzione proporzionale del segnale nelle immagini T2-pesate. I lipomi infiltranti appaiono come masse espansive scarsamente definite e dotate di segnale eterogeneo. Le immagini di tomografia computerizzata e di risonanza magnetica della malattia di Madelung mostrano lesioni multiple e simmetriche nel distretto testa-collo. Le lesioni intraossee appaiono come aree ipodense ben definite talora associate ad espansione e distruzione della corticale.
Conclusioni
La tomografia computerizzata e la risonanza magnetica sono entrambe utili per la diagnosi dei lipomi; la risonanza magnetica, tuttavia, costituisce la tecnica più leaccurata nella valutazione della loro estensione e nella caratterizzazione delle lesioni rare del distretto testa-collo. La somministrazione intravenosa di mezzo di contrasto definisce con maggiore dettaglio i margini del tumore ed il suo pattern di vascolarizzazione.
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Cappabianca, S., Colella, G., Pezzullo, M.G. et al. Lipomatous lesions of the head and neck region: imaging findings in comparison with histological type. Radiol med 113, 758–770 (2008). https://doi.org/10.1007/s11547-008-0258-5
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DOI: https://doi.org/10.1007/s11547-008-0258-5