|
Sonography of
intramuscular myxomas: the bright rim and bright cap signs.J
Ultrasound Med. 2006 Jul;25(7):865-9;
quiz 870-1.
OBJECTIVE: The
objective of this study was to retrospectively review sonographic
images of pathologically proven soft tissue myxomas to determine
whether a sonographic correlate to the bright rim and bright cap signs
described in the magnetic resonance imaging literature is present.
METHODS: The study group consisted of 6 patients with pathologically
proven soft tissue myxomas (1 man and 5 women; age range, 41-72 years;
mean, 56.5 years). The available sonographic images for each subject
were retrospectively reviewed by 2 authors (L.F. and K.F.), with
agreement reached by consensus. Among other findings, images were also
reviewed for a peripheral rim of increased echogenicity (termed the
"bright rim sign") and for the presence of a triangular hyperechoic
area adjacent to at least one of the poles of the mass (termed the
"bright cap sign"). RESULTS: The bright rim and bright cap signs were
seen in 5 (83%) of the 6 myxomas. The single case without the bright
cap sign was not the same case as the one lacking the bright rim sign.
CONCLUSIONS: The sonographic bright rim and bright cap signs were
associated with 5 (83%) of the 6 intramuscular myxomas. These findings
correlate with their magnetic resonance imaging equivalents, which are
well documented in the literature, due to muscle atrophy and adjacent
fatty infiltration. Recognition of these features may assist in a more
accurate sonographic diagnosis before biopsy. |
