Malignant Peripheral Nerve Sheath Tumour: CT and MRI Findings.

Malignant peripheral nerve sheath tumour (MPNST) is extremely rare malignancy in the general population, occurring more frequently in patients with Neurofibromatosis type 1 (NF1). In the literature five cases of MPNST arising from the parapharyngeal space (PPS) in patients without neurofibromatosis have been reported. We report imaging techniques in a patient with MPNST in the PPS, who had neither a family history nor sign of NF1. Computed tomography (CT) scan and magnetic resonance imaging (MRI) were performed for a correct therapeutic planning. CT and MRI findings were correlated with hystopathological diagnosis.

Colovesical fistula in sigmoid diverticulitis. A case report.

Colonic diverticulosis has continuously increased, noticeably left-sided disease. Colovesical fistula is an uncommon complication of diverticulitis, and its most common cause is diverticular disease. Pneumaturia and fecaluria are commonly related symptoms. We present the case of a 79-year-old woman complaining pneumaturia and fecaluria. Abdominal CT showed a colovesical fistula due to sigmoid diverticulitis. After surgical adhesiolysis between the sigmoid colon and the bladder, the defect of the bladder wall was repaired by simple closure. The colonic defect was treated by segmental resection including the rectosigmoid junction. Following the operation the patient continuously improved at months 6, 12 and 18 without evidence of recurrences.

A Rectourethral Fistula due to Transrectal High-Intensity Focused Ultrasound Treatment: Diagnosis and Management.

Colovesical fistula (CVF) is an abnormal connection between the enteric and the urinary systems. The rectourethral fistula (RUF) is a possible but extremely rare complication of treatment of prostate cancer with "transrectal High-Intensity Focused Ultrasound (HIFU) treatment." We present a case of CVF due to HIFU treatment of recurrent prostate cancer. The case was assessed with cystography completed with a pelvic CT scan-with MPR, MIP, and VR reconstruction-before emptying the bladder. Since the CT scan confirmed that the fistula involved solely the urethra and excluded even a minimal involvement of the bladder, it was possible to employ a conservative treatment by positioning a Foley catheter of monthly duration, in order to allow the urethra to rest. Still today, after 6 months, the patient is in a good clinical condition and has not shown yet signs of a recurrence of the fistula.