Sonography of Kimura's Disease in the Groin

Kimura's disease is a rare chronic inflammatory disorder mimicking a malignant tumor. It usually occurs in the head and neck regions, but occasionally shows up in the groin. A gray-scale groin sonograph showed a lobulated hypoechoic mass. Color Doppler sonography revealed the paucity of blood vessels within the mass.

Cyclooxygenase (COX)-1, Cyclooxygenase (COX)-2 and E-cadherin Expression in Colorectal Cancer Patients with Hepatic Metastasis

PURPOSE: Recent studies have shown that cyclooxygenase (COX)-2 may be involved in colorectal carcinogenesis. In this study, we evaluate the differences of COX-2 expression in patients with synchronous and metachronous hepatic metastasis of colorectal cancer. In addition, the expression of COX-1 and E-cadherin were also evaluated. METHODS: Paraffin embedded blocks were obtained from 41 patients who underwent surgery for colorectal cancer with hepatic metastasis. Samples from primary colorectal cancer, synchronous and metachronous hepatic lesions were stained by immunohistochemistry for monoclonal antibody against COX-1, COX-2, and E-cadherin. RESULTS: In colonic COX-1 expression, there was no significant difference in the degree of COX-1 expression between primary colorectal cancer with synchronous hepatic metastasis and that of metachronous hepatic metastasis (P=0.507). In colonic COX-2 and E-cadherin expression, the degree of COX-2 expression was not different between the two groups. But, the patient survival rate in the positive group of COX-1 and COX-2 expression was lower than in the negative group, respectively (P=0.023, P=0.006). CONCLUSION: The degree of colonic COX-1 and COX-2 expression has an impact on prognosis in synchronous and metachronous hepatic metastasis. Further large-scale study is necessary to determine the meaning of COX-2 expression in colorectal cancer.

A Case Report with Plasmablastic Lymphoma of the Jejunum

Plasmablastic lymphoma (PBL) is a recently identified entity that is considered to be a type of diffuse large B-cell lymphoma with a unique immunophenotype and a predilection for the oral cavity of patients with the human immunodeficiency virus (HIV). Although its clinical features may help in the differential diagnosis, an extraoral location in a patient without HIV makes it more difficult to suspect clinically. This case report is the first to describe a patient with PBL originating from the jejunum in a 60-yr-old, HIV-seronegative man. Computed tomography of the face, chest and abdomen showed about a 9.4x9.0 cm mass of the proximal jejunum, multiple masses in the musculoskeletal soft tissue, and multiple lymphadenopathies. The histological examinations demonstrated a large cell lymphoma with plasmablastic differentiation. The neoplastic cells were diffusely positive for MUM1, epithelial membrane antigen and lambda light chains, and focally positive for CD79a; but negative for CD3, CD20, CD30, CD34, CD45RO, CD56, CD99, and CD117. The proliferation index by Ki-67 immunohistochemistry was approximately 70%. These findings were compatible with the diagnosis of PBL. The findings in this case suggest that PBL should be included in the differential diagnosis of a small bowel mass even in a HIV-negative patient.

A case of duodenal gastrointestinal stromal tumor

Gastrointestinal stromal tumors (GISTs) are rare tumers of the alimentary tract, and these tumors arise from primitive mesenchymal cells. Duodenal GISTs comprise 4-5% of all GISTs. In this article, we report on a case of duodenal GIST in 35-year-old male who presented with a fistulo in ano and anal bleeding. Abdominal computed tomography and magnetic resonance imaging revealed a huge tumor, about 11x7 cm in size, of the duodenum. Duodenoscopy revealed a protruded mass with central deep ulceration on the third portion of the duodenum. Endoscopic biopsies showed subepithelial spindle cell proliferation of the tumor, and this was consistent with GIST. Pylorus-preserving pancreaticoduodenectomy was then performed. He subsequently underwent the sphincter-preserving modified loose Seton surgical technique. The patient did not have any problems postoperatively and he remained symptom-free at 6 months after surgery.