Ischemic colitis complicated by Clostridioides difficile infection treated with fecal microbiota transplantation.

Ischemic colitis is an inflammatory condition of the colon that results from insufficient blood supply commonly caused by enterocolitis, vessel occlusion, or shock. In contrast, pseudomembranous colitis is a clinical manifestation of Clostridioides difficile infection (CDI). Ischemic colitis caused by CDI has rarely been reported. Fecal microbiota transplantation (FMT) is an efficient treatment for refractory or fulminant CDI, and the indications for its use have recently expanded. However, performing FMT in patients with ischemic colitis is challenging because of the risk of perforation. Here, we have presented a case of ischemic colitis caused by CDI that was successfully treated with FMT via sigmoidoscopy.

Control Variable Implants Improve Interpretation of Surface Modification and Implant Design Effects on Early Bone Responses: An In Vivo Study.

PURPOSE: This in vivo study used control variable implants to compare early bone responses in fluoride-modified (F-mod) and hydrophilic, sandblasted, large-grit, acid-etched (modSLA) surface implants that differed in implant design. MATERIALS AND METHODS: Four different types of implants (n = 24) were prepared: F-mod surface with Astra Tech implant design; modSLA surface with Straumann implant design; sandblasted, large-grit, acid-etched (SLA) surface with Astra Tech design; and SLA surface with Straumann implant design. Scanning electron microscopy, confocal laser scanning microscopy, and x-ray photoelectron spectroscopy were performed to assess implant surface characteristics. Four implants from each implant type were inserted in the tibiae of four rabbits that were sacrificed 10 days after surgery. Bone-to-implant contact (BIC) and bone area (BA) were measured to evaluate early bone responses. Analysis of variance with Tukey's multiple comparison method was used for the histomorphometric data to find any significant difference. The surface characteristic-related data were analyzed using the Kruskal-Wallis test. The level of significance was .05 in statistical analyses. RESULTS: No significant differences in BIC and BA were found among the modified surfaces (P > .05), whereas significant differences were found in surface topography and surface chemistry. The different designs showed no significant effects on early bone responses when identical surface modifications were applied (P > .05). CONCLUSION: F-mod and modSLA surfaces showed no significant differences in early bone responses. Furthermore, the implant design had no influence on the bone response. This in vivo experimental model will help improve the evaluation of surface modification factors by allowing an independent estimation of one variable (surface modification) against a constant (implant design).

Asymptomatic Splenic Cysts in an Immunocompromised Patient: Should They Be Investigated.

Splenic abscess is a rare disease that generally occurs in immunocompromised patients. It is difficult to distinguish between splenic abscesses and cysts using imaging studies, especially if they are asymptomatic. A 50-year-old asymptomatic man who had received steroid therapy for underlying rheumatoid arthritis was referred to a university hospital due to presence of several splenic cysts, with the largest being 3.5 cm in diameter. Percutaneous aspiration was performed, and fluid analysis showed cysts infected by extended-spectrum, beta-lactamase-producing Escherichia coli. The patient was treated with ertapenem for four weeks, and the lesion disappeared on follow-up imaging studies. Splenic abscess should be included as a differential diagnosis of splenic cystic lesions in immunocompromised patients.

Sentinel lymph node biopsy after neoadjuvant chemotherapy.

BACKGROUND: We surveyed single-center and multi-center studies pertaining to sentinel lymph node biopsy (SLNB) after neoadjuvant chemotherapy to compare the results with those of our current study to evaluate the feasibility and accuracy of SLNB after neoadjuvant chemotherapy. METHODS: From October 2001 to July 2003, 80 patients who had neoadjuvant chemotherapy underwent curative surgery and axillary lymph node dissection (ALND) after SLNB at the Center for Breast Cancer, National Cancer Center. A MEDLINE search was performed using the keywords breast cancer, sentinel lymph node biopsy, and neoadjuvant chemotherapy. RESULTS: Our results showed that 42 (52.6%) of 80 patients had downstaging of the primary tumor; 9 patients (11.3%) had pathologic complete response (pCR) and 33 (41.3%) had pathologic partial response (pPR). 26 patients (32.5%) showed complete axillary clearance after neoadjuvant chemotherapy. Among them, 5 patients (6.3%) revealed pCR of both the primary tumor and axillary metastasis. SLNB was successful in 61 of 80 patients (76.3%) and there were 3 false negatives, yielding a false negative rate (FNR) of 7.3% (3/41), a negation prediction value (NPV) of 87.0%(20/23), and an accuracy of 95.1% (58/61). Thirteen out of 16 studies retrieved by to MEDLINE pertaining SLNB after neoadjuvant chemotherapy concluded its feasibility and accuracy with a identification rate of 82%-100% and a FNR of 17-100%. CONCLUSION: Most studies, including ours, concluded that SLNB after neoadjuvant chemotherapy is accurate and could be an alternative to ALND.

A case of staphylococcal tricuspid valve endocarditis with para-aortic abscess in a patient with bicuspid aortic valve.

Paravalvular abscess is a serious complication of infective endocarditis. The aortic valve and its adjacent ring are more susceptible to abscess formation and paravalvular extension than the mitral valve. A 15-years old patient with bicuspid aortic valve presented with staphylococcal tricuspid valve endocarditis complicated by para-aortic abscess that ruptured into the aortic sinus. We report the clinical, laboratory and echocardiographic features and treatment of this patient and conduct a literature review on this subject.

Sentinel node identification rate, but not accuracy, is significantly decreased after pre-operative chemotherapy in axillary node-positive breast cancer patients.

BACKGROUND: The aim was to prove the low identification rate of sentinel lymph node biopsy (SNB) and to determine the feasibility of replacing axillary lymph node dissection (AND) in axillary lymph node positive patients after chemotherapy. METHODS: From October 2001 to July 2005, 875 consecutive patients with primary operable breast cancer underwent SNB and AND. Among them, 238 received pre-operative chemotherapy. We compared the identification rate, false negative rate (FNR), negative predictive value (NPV), and accuracy of SNB in clinically node-positive patients with or without chemotherapy. RESULTS: The identification rate was significantly lower in patients received chemotherapy (77.6%) than in those not received it (97.0%) (P<0.001). In those received the therapy, the FNR was 5.6%, the NPV was 86.8%, and the accuracy was 95.9%. In those not received therapy, the FNR was 7.4% and the accuracy was 92.6% (differences not statistically significant). CONCLUSION: The identification rate in confirmed axillary lymph node-positive patients was significantly lower in patients received pre-operative chemotherapy, but accuracy did not differ significantly between the two groups. Thus, for patients who achieve complete axillary clearance by chemotherapy, SNB could replace AND.

The melanoma antigen gene as a surveillance marker for the detection of circulating tumor cells in patients with breast carcinoma.

BACKGROUND: Circulating occult tumors cells could be used for the surveillance of metastases after primary breast carcinoma therapy, but their detection is limited by the lack of specific molecular markers. Melanoma antigen genes (MAGEs), which are expressed in malignant tissues but not in normal tissues (except for placenta and testis), might provide such a marker. To date, however, the use of MAGEs in the detection of occult tumor cells using reverse transcription-polymerase chain reaction (RT-PCR) has been limited because of the heterogeneity and low expression of individual MAGEs in tumor tissues. METHODS: We developed multiple MAGE-recognizing primers (MMRPs) that were capable of binding to the cyclic DNA of 6 MAGE-A gene subtypes (MAGE-A1-MAGE-A6). We assessed the ability of the MMRPs to detect the expression of MAGE-A gene subtypes in peripheral blood obtained from patients with benign or malignant breast disease. RESULTS: MAGE-A gene expression was not detected in 32 patients with benign disease but was detected in 1 of 31 patients (3%) patients with negative lymph node breast carcinoma, in 10 of 52 patients (19%) with 1-3 positive lymph nodes, in 11 of 53 patients (21%) with > or = 4 positive lymph nodes, and in 20 of 52 patients (39%) with metastatic disease. The results were statistically significant (P < 0.0001; chi-square test for linear-by-linear association). The results also showed that the detection of MAGE-A gene expression in the blood predicted tumor progression or recurrence. CONCLUSIONS: The results suggested that MAGE-A gene expression may be used for the surveillance of circulating breast carcinoma cells after primary therapy by RT-nested PCR using MMRPs.

Decreased identification rate of sentinel lymph node after neoadjuvant chemotherapy.

We prospectively studied the feasibility of sentinel lymph node biopsy (SLNB) after neoadjuvant chemotherapy by comparing the identification rate and the false-negative rate (FNR) with the results obtained from the patients without chemotherapy. From October 2001 to March 2003, a total of 284 consecutive patients who underwent SLNB and axillary lymph node dissection (ALND) at the Center for Breast Cancer, National Cancer Center were enrolled. Of the 284 patients, 54 underwent neoadjuvant chemotherapy prior to operation. The sentinel lymph node (SLN) was mapped by radioactive colloid alone or in combination with blue dye. All SLNs were evaluated by 2 mm serial sections after hematoxylin-eosin staining. The overall SLN identification rate was 91.9% (261/284): 72.2% (39/54) of the patients after chemotherapy and 96.5% (222/230) of the patients without chemotherapy. These results suggest that preoperative chemotherapy significantly affects lymphatic mapping ( p< 0.001). Among the patients with chemotherapy, there were 3 false negatives in 39 successfully mapped tumors, yielding an FNR of 11.1% (3/27), a negative prediction value (NPV) of 80.0% (12/15), and an accuracy of 92.3% (36/39). There were 10 false negatives among 222 successfully detected patients without chemotherapy, yielding an FNR of 9.9% (10/101), an NPV of 92.4% (121/131), and an accuracy of 95.5% (212/222). These results were not statistically different when compared ( p > 0.05). Although the SLN identification rate significantly decreased after neoadjuvant chemotherapy, SLNB could accurately predict axillary status. Thus SLNB can be an alternative to ALND even after neoadjuvant chemotherapy in cases of successful identification of the SLN.