Figure 1
From: Rectal hemangiopericytoma in a 37-year-old woman: a case report and review of the literature
(A) Intra-vaginal ultrasonography of a pelvic mass. Intra-vaginal ultrasonography showed a 6.0 × 7.6 × 6.0 cm solid mass (M) between the uterus and the rectum. Dynamic contrast-enhanced computed tomography (CT) of the pelvis was used. (B) A non-enhanced CT scan showed the mass between the uterus and the rectum with nearly homogeneous density with a CT number of 20 Hounsfield units (HU). (C) Arterial phase, (D) venous phase, and (E) delayed phase contrast-enhanced CT showed that CT numbers of regions of interest within the mass (oval) gradually enhanced from 53 to 60 to 70 HU, respectively. A marked contrast-enhanced structure (red arrow) corresponding to tortuous vessels was shown with CT values of 140.0 HU in the arterial phase (C) and 111.6 HU in the venous phase (D). (F) Sagittal multi-planar reformation showed the mass (arrow) anteriorly growing and deforming the uterus (*).