Malignant perivascular epithelioid cell tumor of the colorectum: Clinicopathological characterization, diagnosis and treatment process of 7 cases

Figure 1 Pathological results of colorectal malignant perivascular epithelioid cell tumor. A: High magnification view showing epithelioid and spindly tumor cells (hematoxylin and eosin stain); B: Ewing Sarcoma protein RNA binding protein 1 detected by fluorescence in situ hybridization.

Figure 2 Contrast-enhanced abdominal CT scan showed an invasive lesion (orange arrow) located in the anterior wall of the rectum (case 7). A: Non contrast; B: Arterial phase; C: Venous phase.

Figure 3 Treatment process and efficacy evaluation of the 7 cases. NED: No evidence of disease; PD: Progressive disease; Re: Relapse.

Figure 4 Kaplan–Meier curve for progression-free survival of patients with colorectal malignant perivascular epithelioid cell tumor treated by operation. PFS: Progression-free survival.