Sclerosing angiomatoid nodular transformation of the spleen masquerading as a sarcoma metastasis

We report a case of sclerosing angiomatoid nodular transformation (SANT) of the spleen presenting as an incidental splenic mass in a patient with a history of retroperitoneal spindle cell sarcoma. Imaging studies and preoperative fine needle biopsy failed to differentiate this lesion from other vascular splenic lesions or a metastatic focus of a prior sarcoma. The patient was treated with splenectomy, which has proved both diagnostic and therapeutic in this and other cases of SANT. Although histology can lead to the diagnosis of vascular tumor, immunohistochemistry is the only way to confirm the diagnosis of SANT. The etiology of SANT is unknown. SANT of the spleen is a benign lesion that does not recur after splenectomy

Theoretical Study of Edge States in BC 2 N Nanoribbons with Zigzag Edges

Abstract Graphene is an atomically thin carbon sheet in which carbon atoms are arranged in a honeycomb lattice. Due to their outstanding electronic structure and electron transport properties, graphene attracts much interest for future electronic devices. Graphene nanoribbons are finite width graphene sheets. The electronic properties of graphene nanoribbons strongly depend on the edge structures On the other hand, boron and nitrogen atoms behave as acceptors and donors, respectively. Therefore, boron-carbon-nitride, i.e., graphene sheet doped with B and N, should show interesting electronic properties with controllability by doping. BC 2 N sheet is organic analogous of graphene, which can be regarded as one of example of boron-carbon-nitride. Graphite-like BC 2 N was synthesized using chemical vapor depositions of boron trichloride, BCl 3 , and acetronitrile, CH 3 CN In this paper, we investigate the electronic properties of BC 2 N nanoribbons with zigzag edges using a tight binding model. In the tight-binding model, B and N atoms are described by higher and lower site energy, E B and E N , compared with that of C atom, E C , respectively Figure 1 (b) shows calculated results of the band structures of BC 2 N nanoribbons for N = 10. We observed the flat bands at E = 0. However, we confirm that the flat bands are absent if atoms are not arranged as B-C-N-C along the zigzag lines. Therefore, we can conclude that B-C-N-C arrangement along the zigzag line is necessary to obtain the flat bands. In the right part of In the model-1, the charge distributions at the both edges are different each other, i.e., the charge distribution at the edge, where the outermost sites are occupied with C atoms, is similar to that at the conventional zigzag edge, while the charge of the edge states at the edge, where the outermost sites are occupied with B and N atoms, distributes the both sublattice sites. Recently, Kaneko et al. showed that the edge states in zigzag graphene nanoribbons are robust on the substitution of outermost C atoms with B and N atoms alternately In this paper, we also performed the first-principles calculations based on the density functional theories within projector-augmented wave method and the local density approximation implemented in VASP code. We shall discuss the comparison of the results within the tight-binding model with those within the density functional theories

<ORIGINAL>A prospective randomized clinical study on the efficacy of CO_2 lasers on initial stage endodontics

The purpose of this study was to evaluate the clinical efficacy of the CO_2 laser in a prospective randomized trial. A total of 112 teeth in 112 patients, previously treated pulpectomy procedures were gathered and randomly divided into two groups composed of 56. Irradiation was performed on one group and non-irradiation forms of treatment were performed on the other group. On the first group of teeth, root canal enlargement was done and followed by exposure of the canal to a CO_2 laser light (5W, 200msec) using 3 cycles each at a rate of 15 seconds per cycle. The second group was not exposed to laser light following root canal enlargement. The laser was applied on the root canal for a controlled period of time. On the day following pulpectomy, a statistically significant (p < 0.05) fewer number of patients observed pain in the irradiation group compared to the non-irradiation group. The treatment times and the total treatment days in the irradiation group are shorter than in the non-irradiation group (p < 0.05). Multivariate analysis showed that the laser treatment was significantly associated with treatment times. This study shows that the degree of oral pain was greatly reduced in patients who underwent laser irradiation as compared to these who did not. Our study suggests that the use of laser treatment provide significant short-term improvement compared to conventional forms of treatment performed during pulpectomy

Ultrasonographic features and vascular patterns of the submandibular gland

The ultrasonographic features and intranodal vascular patterns of the submandibular glands were evaluated to establish criteria for the diagnosis of salivary glands. There were significant differences between the internal echo of the submandibular glands and the parotid glands and the tongue. The internal echo of the submandibular gland indicated the lowest intensity. The internal echo intensity in the under 30% weight/height ratio group was hypoechoic, and the echo intensity in the over 50% weight/height ratio group was hyperechoic. The ratio of the obvious posterior echo of the submandibular glands were 11.0-15.0%. The ratio of the obvious boundary echo of the submandibular glands were 2.5-3.6%. No lateral shadow was observed. Continuity of the bifurcation part with the trunk was observed in 17 facial arteries (68%), 14 submental arteries (56%), and these arteries were easily examnined. Continuity was observed in 1 branch of the external carotid artery (4%), and the suprahyoid branch of the lingual artery was not observed

Idiopathic Bone Cavity of the Mandible

A case of an idiopathic bone cavity is presented and discussed. The patient was a 54-year-old Japanese male with a history of stomach carcinoma operation and hospitalization two years ago. He was referred to the Department of Dental Radiology with a panoramic radiograph performed by the dentist. The panoramic radiograph demonstrated a well-defined elliptical radiolucent lesion near the right angle of the mandible, situated below the mandibular canal and slightly above the inferior border of the mandible. The patient stated that the lesion progressed asymptomatically without any sensation. From the lesion was indicated, the patient was greatly anxious about metastasis of stomach carcinoma to the mandible. To define the diagnosis of the lesion, intraoral radiography, extraoral radiography, tomography, and sialography were carried out. All results showed that the lesion was an idiopathic bone cavity without relationship to salivary gland tissue. No biopsy was carried out, but the lesion was diagnosed to be benign, and a metastatic carcinoma was ruled out