Non-invasive MR assessment of macroscopic and microscopic vascular abnormalities in the rectal tumour-surrounding mesorectum.

Abstract:

OBJECTIVES:To evaluate the MRI macroscopic and microscopic parameters of mesorectal vasculature in rectal cancer patients. METHODS:Thirteen patients with rectal adenocarcinoma underwent a dynamic contrast-enhanced MRI at 1.5 T using a blood pool agent at the primary staging. Mesorectal macrovascular features, i.e., the number of vascular branches, average diameter and length, were assessed from baseline-subtracted post-contrast images by two independent readers. Mesorectal microvascular function was investigated by means of area under the enhancement-time curve (AUC). Histopathology served as reference standard of the tumour response to CRT. RESULTS:The average vessel branching in the mesorectum around the tumour and normal rectal wall was 8.2 ± 3.8 and 1.7 ± 1.3, respectively (reader1: p = 0.001, reader2: p = 0.002). Similarly, the tumour-surrounding mesorectum displayed circa tenfold elevated AUC (p = 0.01). Interestingly, patients with primary node involvement had a twofold higher number of macrovascular branches compared to those with healthy nodes (reader1: p = 0.005 and reader2: p = 0.03). A similar difference was observed between good and poor responders to CRT, whose tumour-surrounding mesorectum displayed 10.7 ± 3.4 and 5.6 ± 1.5 vessels, respectively (reader1/reader2: p = 0.02). CONCLUSIONS:We showed at baseline MRI of rectal tumours a significantly enhanced macrovascular structure and microvascular function in rectal tumour-surrounding mesorectum, and the association of primary mesorectal macrovascular parameters with node involvement and therapy response. KEY POINTS:• Vascular MRI reveals macrovascular and microvascular abnormalities in the rectal tumour-surrounding mesorectum. • Formation of highly vascular stroma precedes the actual tumour invasion. • High macrovascular parameters are associated with node involvement. • Mesorectal vascular network differs for good and poor responders.

journal_name

Eur Radiol

journal_title

European radiology

authors

Kluza E,Kleijnen JP,Martens MH,Rennspiess D,Maas M,Jeukens CR,Riedl RG,zur Hausen A,Beets GL,Beets-Tan RG

doi

10.1007/s00330-015-3955-1

subject

Has Abstract

pub_date

2016-05-01 00:00:00

pages

1311-9

issue

5

eissn

0938-7994

issn

1432-1084

pii

10.1007/s00330-015-3955-1

journal_volume

26

pub_type

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