P. Shannon et al., ANEURYSMAL CYST OF SOFT-TISSUE - REPORT OF A CASE WITH SERIAL MAGNETIC-RESONANCE-IMAGING AND BIOPSY, Human pathology, 28(2), 1997, pp. 255-257
We report a case of an extraosseous aneurysmal cyst arising in the lef
t retroclavicular soft tissue of a 29-year-old woman, A magnetic reson
ance imaging (MRI) scan showed a solid lesion within soft tissue, abut
ting the clavicle without bone involvement, An incisional biopsy was i
nterpreted as showing osteoclast rich nodular fasciitis with prominent
vascularity, A second MRI 5 months later showed intralesional cystic
change with areas of increased signal on TB weighted images, still wit
hout any bony defect, The lesion was excised, Histological examination
revealed large vascular spaces lined focally by Want cells, The remai
nder of the lesion was composed of an admixture of spindle cells and o
steoclast-like giant cells. The histological and ultrastructural appea
rance was that of an aneurysmal bone cyst; however, in view of the lac
k of any bony involvement, a diagnosis of aneurysmal cyst of soft tiss
ue was made, Primary aneurysmal cysts of soft tissue are rare; this is
the third well-documented case in the literature, and the first to de
scribe both the;MRI appearance and the histological evolution from a s
olid to multiloculated lesion, Copyright (C) 1997 by W.B. Saunders Com
pany.