Diagnostic Ultrasound - Abdomen and Pelvis

Cystic Peritoneal Mass
Pseudomyxoma Peritonei
Gastrointestinal Stromal Tumor (GIST)
(Left) Transverse ultrasound
demonstrates multiple septa
and low-level echoes in
pseudomyxoma peritonei
anterior st and posterior
to the liver ſt. (Right)
Longitudinal ultrasound of the
left upper quadrant shows a
recurrent gastric
leiomyosarcoma post
surgery and protein kinase
inhibitor. Posterior acoustic
enhancement and lack of
internal color flow indicate
necrosis and response to
treatment.
Differential Diagnoses:
Abdominal Wall/Peritoneal Cavity
Mesenteric Teratoma
Mesenteric/Omental Cyst
(Left) Longitudinal ultrasound
shows a large cystic ſt lesion
inferior to the liver . Mural
nodules were present and
there was fat in this teratoma.
It can be difficult to
differentiate intraperitoneal
from retroperitoneal masses
when they are very large.
(Right) Transverse ultrasound
of the mid abdomen region
shows a mesenteric cyst ſt
containing low-level echoes
with more tubular
lymphangiectasia st. The wall
of the cyst is thin and has a
single layer.
Enteric Duplication Cyst
Urachal Cyst/Abscess
(Left) Transverse ultrasound
shows an ileal duplication cyst
with internal debris , The
echogenic mucosal ſt and
hypoechoic muscularis st
layers confirm that this is of
bowel origin. (Right)
Longitudinal ultrasound of the
midline pelvis shows a thick
walled urachal abscess ſt
extending to the thickened
rectus muscle st. Urachal
cancer may appear similar,
tissue diagnosis is required.
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