A 52 year old male presented with changes in bowel movements, and a mass was detected on digital rectal exam. Both CT and MRI revealed a large pelvic and gluteal mass filling the pelvic cavity displacing the adjacent pelvic structures. After surgical removal, pathology revealed solitary fibrous tumor; a rare neoplasm uncommonly discovered in the thorax, and even less commonly in extrapleural lo...

RATIONALE Rectal neuroendocrine tumor (NET) is a relatively rare tumor. Well-differentiated NETs (G1 and G2) rarely display distant metastasis at initial diagnosis. Currently, treatment for the primary lesions of rectal NETs with liver metastasis remains controversial. The liver metastasis was resected in local hospital. Transanal endoscopic microsurgery (TEM) has emerged as an effective minima...

A 63-year-old woman with a sense of perineal discomfort was referred to our hospital. Digital examination revealed an irregular rectal tumor, and the distance from the anal verge was 0.5 cm. The lower endoscopic examination demonstrated an ulcerated tumor with a sharply demarcated margin, 6 cm in size, occupying a half circumference of the rectum. There was another tumor, 2 cm in size, protrudi...

Tumor detection prior to invasion through the muscularis propria and before lymph node metastases appear offers the best prognosis and permits more limited surgery.2 Anterior or abdominoperineal resection is the standard treatment for rectal tumors, although a greater proportion of resections are now sphincter-saving or involve local excision.3,4 Despite surgical advances, local recurrence rate...

R ECTAL CARCINOIDS ARE rare and their biologic behavior and optimal surgical treatment remain poorly defined. Classically, primary tumors less than 2 cm were assumed to be indolent and were treated by transanal excision. We hypothesized that rectal carcinoids are more malignant than previously described and tumors less that 2 cm may warrant more aggressive surgery. The charts of 62 consecutive ...

INTRODUCTION Retro-rectal cystic hamartoma (tailgut cyst) is a rare congenital developmental lesion arising from post-natal primitive gut remnants in the retro-rectal space. The rarity of the lesion and its anatomical position usually leads to difficulty in diagnosis and surgical management. Complete surgical resection remains the cornerstone of treatment. A dozen or so surgical approaches have...

In vivo trans-rectal near-infrared (NIR) optical tomography was performed concurrently with, albeit reconstructed without spatial a prior of, trans-rectal ultrasound (US) on transmissible venereal tumor (TVT) developed as a model in the canine pelvic canal. Studies were taken longitudinally at prior to, 14 days after, and 35 days after the TVT injection. As the tumor grew, the nodules became in...

Water molecular diffusion in vivo tissue is much more complicated. We aimed to compare non-Gaussian diffusion models of diffusion-weighted imaging (DWI) including intra-voxel incoherent motion (IVIM), stretched-exponential model (SEM) and Gaussian diffusion model at 3.0 T MRI in patients with rectal cancer, and to determine the optimal model for investigating the water diffusion properties and ...

Rectal neuroendocrine tumor (NET) is a relatively rare tumor. NET is classified as G1, G2, or G3 according to the degree of mitosis or Ki-67 proliferation index, which reflect the malignant potential of the tumor, such as metastasis. Advanced cases with metastasis are indicated for chemotherapy treatment. However, the efficacy of chemotherapy is limited. Therefore, resection is considered, even...