Keywords:
Abdomen, Gastrointestinal tract, Oncology, CT, Staging, Surgery, Cancer
Authors:
X. Chengqian1, X. Zhao2; 1100021/CN, 2Beijing/CN
DOI:
10.1594/ecr2013/C-2528
Methods and Materials
Patient selection
This retrospective study was approved by our hospital's institutional review board,
and the requirement for informed consent was waived.
We reviewed a series of 10 cases in our hospital between Jan 2006 and Feb 2012.
Patients with histopathologic confirmed anorectal melanoma who had undergone material-enhanced CT prior to surgery were included.These included 4 male and 6 female (mean age: 61 years; age range, 41-75 years).
CT technique
- 10 patients were performed CT by using the Toshiba Aquillion 64-MDCT scanner.
They underwent abdomen-pelvic scan.
A bolus of nonionic contrast agent (Ultravist 300ml I/L) was used as the contrast material for dynamic contrast-enhanced CT images,
administered as an IV infusion,
injected at a rate of 3~3.5 mL/s and at a dose of 1.5ml/kg body weight.
- Dynamic CT images were obtained 65-70 seconds after completion of the intravenous injection.
Images with 5mm-thick sections were acquired and reconstruction was performed with the thickness of 1.25mm and reconstruction interval of 0.8 mm for both scanners.
Clinicopathologic features
Symtoms,
treatment modalities and prognosis were reviewed in the patient record system.
Imaging analysis
All CT images were analyzed by two certified radiologist The images were read simultaneously by both readers and a consensus was reached.
Tumor involved site,
size,
morphology,
infiltration,
lymphadenopathy and metastasis were evaluated.
Statistics
- Quantitative variables: were shown as means±standard deviations.
- Classified variables: were shown as counts and percentages.