Rectal amoebiasis mimicking malignancy

contributed by: Dr. Gautami Parmar
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Findings
A triphasic CT scan of abdomen and pelvis was performed after positive oral and rectal contrast administration on 256 slice multidetector dual CT scanner machine, followed by a plain MRI of pelvis on 3T scanner. Contrast CT images showed asymmetrical, inhomogenously enhancing rectal wall thickening and a non-enhancing polypoidal soft-tissue density lesion along right lateral aspect of rectum projecting intraluminally.

T2-weighted fat suppressed images showed abnormal hyperintense wall-thickening of upper and mid rectum of about 10-12 mm and an intraluminal hypointense polypoidal lesion of about 20x15 mm in axial plane.

Mild fat stranding was seen in mesorectal fascia. A small perirectal node was also present.

Mild presacral fluid was seen.

There were no signs of intestinal obstruction. Mild thickening of sigmoid and ascending colon was seen. The other abdominal organs were normal.

The diffusion-weighted images did not reveal any abnormal restricted diffusion within the lesion and the lymph node.
Diagnosis
Rectal amebiasis
Dr. Gautami Parmar MD , EDIR , DICRI is a Consultant Radiologist from with experience of 3-5 years post-graduated from Baroda Medical College, Baroda. Specialized in Reporting of CT-SCAN , MRI cases with expertise in Neuro-imaging , Musculoskeletal , Trauma , Stroke-imaging , Cardiac
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