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Comparison between endorectal coil and pelvic phased-array coil magnetic resonance imaging in patients with anorectal tumor

Magnetic resonance imaging (MRI) has been used as one of the diagnostic tools in the preoperative evaluation of rectal cancer. However, the usefulness of endorectal coil (ERC) compared with phased array coil (PA) MRI is still unknown. Nineteen patients with rectal (17 patients) and anal (2 patients)...

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Published in:The American journal of surgery 2003-04, Vol.185 (4), p.328-332
Main Authors: Matsuoka, Hiroyoshi, Nakamura, Akihisa, Masaki, Tadahiko, Sugiyama, Masanori, Takahara, Taro, Hachiya, Junichi, Atomi, Yutaka
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description Magnetic resonance imaging (MRI) has been used as one of the diagnostic tools in the preoperative evaluation of rectal cancer. However, the usefulness of endorectal coil (ERC) compared with phased array coil (PA) MRI is still unknown. Nineteen patients with rectal (17 patients) and anal (2 patients) tumors undergoing both ERC-MRI and PA-MRI preoperatively were included in the study. Seventeen patients had advanced stage tumors, and the remaining 2 had early stage tumors. The diagnostic accuracy of depth tumor invasion and lymph node metastasis were compared with reference to the histopathologic findings as the gold standard. ERC-MRI was evaluable in only 10 (52.6%) of 19 patients, because of difficulties in ERC placement, whereas PA-MRI could be obtained in all patients (100%). In 10 patients examined by both modalities, the diagnostic accuracy of depth of tumor invasion was 80% by ERC-MRI and 80% by PA-MRI. In lymph node staging, ERC yielded sensitivity of 100%, specificity of 62.5%, and overall accuracy of 70.0%. The corresponding values for PA-MRI were 50%, 100% and 90.0%, respectively. These figures were not significantly different between the two modalities. ERC-MRI and PA-MRI showed similar diagnostic accuracy. ERC-MRI may be abandoned in the preoperative staging of patients with locally advanced anorectal tumors because of its limited clinical utility.
doi_str_mv 10.1016/S0002-9610(02)01405-8
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subjects Accuracy
Adult
Aged
Aged, 80 and over
Anus
Anus Neoplasms - diagnosis
Anus Neoplasms - pathology
Biological and medical sciences
Carcinoma - diagnosis
Carcinoma - pathology
Catheters
Digestive system
Endorectal coil
Endoscopy
Feasibility Studies
Female
Humans
Investigative techniques, diagnostic techniques (general aspects)
Lymphatic Metastasis
Lymphatic system
Magnetic resonance imaging
Magnetic Resonance Imaging - instrumentation
Magnetic Resonance Imaging - methods
Male
Medical sciences
Melanoma
Melanoma - diagnosis
Melanoma - pathology
Metastasis
Middle Aged
Neoplasm Invasiveness
Neoplasm Staging
NMR
Nuclear magnetic resonance
Patients
Predictive Value of Tests
Radiodiagnosis. Nmr imagery. Nmr spectrometry
Rectal carcinoma
Rectal Neoplasms - diagnosis
Rectal Neoplasms - pathology
Rectum
Skin cancer
Tumors
Ultrasonic imaging
title Comparison between endorectal coil and pelvic phased-array coil magnetic resonance imaging in patients with anorectal tumor
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