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Radiology, Vol 200, 531-536, Copyright © 1996 by Radiological Society of North America

ARTICLES

MR imaging of digital mucoid cysts

JL Drape, I Idy-Peretti, S Goettmann, A Salon, P Abimelec, H Guerin-Surville and J Bittoun
Department of Skeletal Radiology, Hopital Cochin, Paris, France.

PURPOSE: To assess the usefulness of magnetic resonance (MR) imaging in the diagnosis and clarification of the physiopathology of digital mucoid cysts. MATERIALS AND METHODS: Twenty-three patients (14 women, nine men; aged 52-75 years) with mucoid cysts underwent MR imaging at 1.5 T with a local surface gradient coil. The pixel size was 117 microns in one direction. T2 relaxation times were measured. Contrast material was intravenously administered in 15 patients. RESULTS: All mucoid cysts had high signal intensity and sharp borders on T2-weighted images. Intracystic septa were present in nine patients (39%). Most cysts were solitary (n = 13) and/or in the proximal nail fold (n = 16). Satellite cysts were present in five patients. Nineteen patients (83%) had cysts with pedicles that extended to the joint. Osteoarthritis of the distal interphalangeal joint was present in 16 patients (70%). Five patients (22%) had multiple flattened cysts that were usually independent of the joint. In seven patients (30%), MR images showed cysts beneath the nail plate. CONCLUSION: Digital mucoid cysts may be polymorphic. MR imaging is helpful when cysts are in the nail bed.


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