Figure 2.

MRI images from the same patient in the control group: A male, aged 35 years, with a feeling of incomplete defecation for one year, occasional anal pain, and slight blood in the stool. Swollen masses were identified by finger examination. (A) A T2WI cross-section showing abnormal occupation signals on the right side of the intestinal wall. (B) DCE-MRI scanning images showing similar enhancement of the space occupation of the selected intestinal wall compared with the surrounding regions. (C) DCE-MRI pseudo-color images of Ktrans. The blue color was evenly distributed along the intestine, and the Ktrans of the ROI was 0.100. (D) DCE-MRI pseudo-color images of Kep. The lesion area was blue, where Kep was 0.428. (E) DCE-MRI pseudo-color images of Ve. The lesion area was blue, where Ve was 0.336. (F) DCE-MRI pseudo-color images of iAUC. The lesion area was blue, where iAUC was 18.834, which was comparable with the surrounding intestinal wall tissue. (G) The DCE-MRI time-signal intensity curve of the control revealed a pattern of a rapid rise, followed by a plateau. (H) Results of the postoperative pathology test (hematoxylin and eosin staining, ×100). Cysts were formed in the intestinal submucosa, filled with mucus. Mucus overflow formed a mucus paste outside several of the cysts. No atypical gland structures or cells were observed surrounding the cysts. Fibrosis, chronic inflammatory cell infiltration, and vascular dilatation and congestion were seen in the submucosa. The patient in the control group was diagnosed with colitis cystica profunda. DCE-MRI, dynamic contrast-enhanced magnetic resonance imaging; Ktrans, volume transfer constant from the plasma compartment to the extravascular extracellular space; Kep, rate constant for transfer between extravascular extracellular space and the blood compartment; Ve, volume of extravascular extracellular space per unit volume of tissue; iAUC, initial area under enhancement curve.