Solitary Fibrous Tumor of the Ischiorectal Fossa : CT and MRI Findings

Solitary fibrous tumor (SFT) is a rare neoplasm, which is usually presented as a pleural based mass, but can also occur in unusual locations based on its mesenchymal origin. However, the radiologic features of SFT occurred in the ischiorectal fossa have been rarely reported. In this case, we describe the MRI findings in a case of a SFT involving the ischiorectal fossa of a 36-year-old man. The tumor appeared as homogeneous iso-signal intensity relative to the adjacent muscle on T1 weighted images, a mixed high signal intensity on the T2 weighted images, and heterogeneous enhancement following the administration of the contrast material.

Aggressive Angiomyxoma at Ischiorectal Fossa / 대한산부인과학회잡지

Aggressive angiomyxoma is a rare soft tissue tumor associated with high risk of local recurrence but lacks metastatic potential. This tumor arise from soft tissue of the perineum or lower pelvis, and affect predominantly yonug women. Aggressive angiomyxoma should be distinguished from more common benign and malignant tumor or tumor like conditions of the pelvic soft part. We report a case of an ususual angiomyxoma in ischiorectal fossa with a brief review of the literature.

Aggressive AngiOmYxoma Occuring in Ischiorectal Fossa: A case report

We report a case of aggressive angiomyxoma in ischiorectal fossa of a 39-year-old women. The tumor is characterized by relatively large size(13 x 11 cm), grossly gelatinous appearance and locally infiltrative nature. Microscopically, it consists of many variable sized blood vessels and spindle or stellate cells widely separated in myxoid or collagenous stroma. Immunohistochemical stains reveal that the tumor cells are strongly positive for actin and desmin. Electron microscopic findings are that of a few cells dispersed in abundant intercellular substance and collagen bundles. These cells form irregular cytoplasmic process without basal lamina and contain endoplasmic reticulum having cistern.