Rectal Teratoma coexistent with an Ovarian Teratoma: A Case Report

We report a case of rectal teratoma coexistent with an ovarian teratoma. To our knowledge, this is the first radiologic report of rectal teratoma. Computed tomography (CT) showed a sharply demarcated cystic and fatty mass with amorphous calcification in the rectum. A double-contrast barium study showed a well-defined intraluminal rectal mass without mucosal destruction. Imaging findings of rectal teratoma allow for correct preoperative diagnosis. CT was helpful in differentiating rectal teratoma from other rectal lesions.

CT Findings of Locoregional Recurrence after Curative Resection of Colorectal Cancer

Postoperative recurrence is a major cause of mortality and morbidity for the patients suffering with colorectal cancer. Therefore, patients with colorectal cancer are routinely followed up with CT to detect the presence of locoregional recurrence and distant metastases. A central goal of postoperative surveillance for colorectal cancer is to improve survival through the earlier identification of tumor recurrence. Locoregional recurrence refers to tumor occurring at or adjacent to the surgical site and at the regional lymph nodes. It has been reported that metastatic spread based on the site of the primary tumor shows a relatively predictable pattern. Given the prevalence of colorectal cancer and the role of CT for postoperative surveillance, radiologists should be familiar with the CT findings of locoregional recurrence after curative resection for colorectal cancer.

Low Grade MALT Lymphoma of Rectum: A Case Report

We report a case with low-grade MALT lymphoma of the rectum in a 32-year-old man. Primary lymphoma of thecolon is rare and comprises less than 1 % of large bowel malignancies. Recently, large part of colonic lymphomahave been shown to be MALT lymphoma, which is a distinct type of B-cell lymphoma. The radiologic findings of thiscase are mucosal nodularity with shallow ulcers in the rectum, as seen on bar-ium enema, and rectal wallthickening, as seen on CT. There was no evidence of intra-abdominal lym-phadenopathy nor hepatosplenomegaly. Suchradiologic findings are rather similar to the findings in cases of inflammatory bowel disease, rending thedifferential diagnosis difficult.

CT Findings and Clinical Characteristics of Colorectal Mucinous Adenocarcinoma

PURPOSE: To establish the CT findings and clinical characteristics of colorectal mucinous adenocarcinoma. MATERIALS AND METHODS: The CT features of 26 surgically proven cases of colorectal mucinous adenocarcinoma were reviewed. The subjects were selected from among 262 patients with colorectal cancer, of whom 40 with non-mucinous adenocarcinoma were included as a control group. Contrast-enhaneed CT images were analyzed for tumor location, the presence or absence of tumoral calcification, tumor shape (circumferential or eccentric, polypoid or infiltrative), tumor thickness-to-length ratio, and attenuation and homogeneity. In each group, the TNM stage of pathologic specimens was compared. During follow-up, the incidence of recurrence, and outcome, were also compared. RESULTS: CT images of mucinous adenocarcinoma revealed intratumoral calcification in three patients (12%, p < 0.01). Tumors were eccentric and polypoid-shaped, with a high tumoral thickness/length ratio (p < 0.01). On contrast-enhanced images, most were seen as a heterogenous hypoattenvuted mass. No differences in T-NM stage were found in surgical specimens. In patients with mucinous adenocarcinoma, recurrence during the early follow-up period is more common than in patients with non-mucinous cancer. CONCLUSION: Contrast-enhanced CT reveals mucinous adenocarcinoma as an eccentric polypoid mass with heterogeneous hypoattenuation. In patients with mucinous colorectal cancer, careful follow-up is required because tumors tend to recur early in the follow-up period.

CT Findings and Clinical Characteristics of Colorectal Mucinous Adenocarcinoma

PURPOSE: To establish the CT findings and clinical characteristics of colorectal mucinous adenocarcinoma. MATERIALS AND METHODS: The CT features of 26 surgically proven cases of colorectal mucinous adenocarcinoma were reviewed. The subjects were selected from among 262 patients with colorectal cancer, of whom 40 with non-mucinous adenocarcinoma were included as a control group. Contrast-enhaneed CT images were analyzed for tumor location, the presence or absence of tumoral calcification, tumor shape (circumferential or eccentric, polypoid or infiltrative), tumor thickness-to-length ratio, and attenuation and homogeneity. In each group, the TNM stage of pathologic specimens was compared. During follow-up, the incidence of recurrence, and outcome, were also compared. RESULTS: CT images of mucinous adenocarcinoma revealed intratumoral calcification in three patients (12%, p < 0.01). Tumors were eccentric and polypoid-shaped, with a high tumoral thickness/length ratio (p < 0.01). On contrast-enhanced images, most were seen as a heterogenous hypoattenvuted mass. No differences in T-NM stage were found in surgical specimens. In patients with mucinous adenocarcinoma, recurrence during the early follow-up period is more common than in patients with non-mucinous cancer. CONCLUSION: Contrast-enhanced CT reveals mucinous adenocarcinoma as an eccentric polypoid mass with heterogeneous hypoattenuation. In patients with mucinous colorectal cancer, careful follow-up is required because tumors tend to recur early in the follow-up period.