Revisiting imaging features of rectosigmoid vascular malformation with emphasis on multiparametric MRI: a case report

Abstract

Background Gastrointestinal vascular malformations are rare benign vascular neoplasms of the gastrointestinal tract, with the rectosigmoid region being the most frequently involved site. Patients often manifest with recurrent, intermittent rectal bleeding, which might occasionally be life-threatening. Case presentation A 39-year-old man with a history of hemorrhoid operations twice was presented to our gastroenterology department with blood in the stool and abdominal pain. After the colonoscopy, multiparametric MRI, and CT examinations, robotic low anterior resection was performed with the diagnosis of rectosigmoid venous malformation. The histopathological examination confirmed the diagnosis. Conclusion Colonoscopy is the preferred method in diagnosing rectosigmoid vascular malformation, but wrong and delayed diagnoses are common. Thus, imaging modalities might add to colonoscopy in equivocal cases.

Anal and Perianal Masses: The Common, the Uncommon, and the Rare

“…Colonoscopy in such cases may reveal nodular submucosal tumorlike lesion in the anorectum with normal or edematous overlying mucosa. 46 They can also be divided into high-and low-flow lesions. 46 High-flow lesions should have an arterial component.…”

“…46 They can also be divided into high-and low-flow lesions. 46 High-flow lesions should have an arterial component. MRI can help in diagnosing VM and help in defining its extent.…”

“…MRI can help in diagnosing VM and help in defining its extent. 46 Low-flow malformations have cluster of cystic spaces with or without fluid debris layer (►Fig. 14), whereas high-flow malformations contain signal voids.…”