Unicystic ameloblastoma of the mandible - an unusual case report and review of literature

Ameloblastoma is a true neoplasm of odontogenic epithelial origin. It is the second most common odontogenic neoplasm, and only odontoma outnumbers it in reported frequency of occurrence. Its incidence, combined with its clinical behavior, makes ameloblastoma the most significant odontogenic neoplasm. Unicystic ameloblastoma (UA) refers to those cystic lesions that show clinical, radiographic, or gross features of a mandibular cyst, but on histologic examination show a typical ameloblastomatous epithelium lining part of the cyst cavity, with or without luminal and/or mural tumor growth. It accounts for 5-15% of all intraosseous ameloblastomas. We report a case of unicystic ameloblastoma in a 30-year-old female, and review the literature

Pedicled anterolateral thigh flap for contralateral groin composite defect

Pedicled anterolateral thigh flap has been well described for ipsilateral groin defects. Its versatility depends on the intact femoral vessels. When the external iliac and the femoral vessels are absent, especially secondary to wide surgical tumour ablations in the groin region, ipsilateral ALT flap is not an option. Free flaps also are difficult because of lack of recipient vessels. We report a case of composite groin defect following wide resection of recurrent liposarcoma along with encased vessels which was covered with a pedicled anterolateral thigh flap from the opposite thigh. The technique of lengthening the vascular pedicle and medializing the pedicle, to effectively increase its reach to the contralateral anterior superior iliac spine without vascular compromise, is described

Pedicled anterolateral thigh flap for contralateral groin composite defect

Pedicled anterolateral thigh flap has been well described for ipsilateral groin defects. Its versatility depends on the intact femoral vessels. When the external iliac and the femoral vessels are absent, especially secondary to wide surgical tumour ablations in the groin region, ipsilateral ALT flap is not an option. Free flaps also are difficult because of lack of recipient vessels. We report a case of composite groin defect following wide resection of recurrent liposarcoma along with encased vessels which was covered with a pedicled anterolateral thigh flap from the opposite thigh. The technique of lengthening the vascular pedicle and medializing the pedicle, to effectively increase its reach to the contralateral anterior superior iliac spine without vascular compromise, is described

Fusion of covariance matrices of PCA and FLD

In this paper, we propose a novel approach for fusing two classifiers, specifically classifiers based on subspace analysis, during feature extraction. A method of combining the covariance matrices of the Principal Component Analysis (PCA) and Fisher Linear Discriminant (FLD) is presented. Unlike other existing fusion strategies which fuse classifiers either at data level, or at feature level or at decision level, the proposed work combines two classifiers while extracting features introducing a new unexplored area for further research. The covariance matrices of PCA and FLD are combined using a product rule to preserve the natures of both covariance matrices with an expectation to have an increased performance. In order to show the effectiveness of the proposed fusion method, we have conducted a visual simulation on iris data. The proposed model has also been tested by performing clustering on standard datasets such as Zoo, Wine, and Iris. To study the versatility of the proposed method we have carried out an experimentation on sports video shot retrieval problem. The experimental results signify that the proposed fusing approach has an improved performance over individual classifiers. (C) 2010 Elsevier B.V. All rights reserved

Partial resource pooling in loss systems with two players

International audienceIt is well known that resource sharing or resource pooling can help improve resource utilisation ofindependent entities providing similar for using similar resources. In traditional sharing mechanisms, entities pool either all their resources or do not participate. Binary mechanisms are helpful when the objective is to maximize the system (or overall) utility. However, when each entity is maximizing its own utility, these mechanisms are not always successful at prescribing solutions that are acceptable to all the participating entities.In this paper, we propose two partial sharing models in which both providers improve their individual utilities byfollowing the prescribed sharing strategy. By partial sharing we mean that each provider possibly pools in only a part of itsresources. The providers are modelled as M/M/N/N queues, with different number of servers of each provider., and a provider may pool any number of its servers. Our partial sharing models encompasses the two extreme cases of full pooling and no pooling that appear in traditional mechanisms

Partial resource pooling in loss systems with two players

International audienceIt is well known that resource sharing or resource pooling can help improve resource utilisation ofindependent entities providing similar for using similar resources. In traditional sharing mechanisms, entities pool either all their resources or do not participate. Binary mechanisms are helpful when the objective is to maximize the system (or overall) utility. However, when each entity is maximizing its own utility, these mechanisms are not always successful at prescribing solutions that are acceptable to all the participating entities.In this paper, we propose two partial sharing models in which both providers improve their individual utilities byfollowing the prescribed sharing strategy. By partial sharing we mean that each provider possibly pools in only a part of itsresources. The providers are modelled as M/M/N/N queues, with different number of servers of each provider., and a provider may pool any number of its servers. Our partial sharing models encompasses the two extreme cases of full pooling and no pooling that appear in traditional mechanisms

Pilomatricoma with apocrine poroma: A novel cutaneous collision tumor

The term “collision tumor” implies the occurrence of two or more neoplasms in a single biopsy specimen. This is a rare feature in skin biopsies, with most of the reported combinations involving melanocytic lesions or basal cell carcinomas. Combinations of adnexal tumors are found very sporadically. We report a 67-year-old woman with a scalp nodule, clinically suspected to be verrucous carcinoma, who underwent a wide excision. Histopathology showed apocrine poroma with adjacent regressing pilomatricoma

Sharing Within Limits: Partial Resource Pooling in Loss Systems

International audienceFragmentation of expensive resources, e.g., spectrum for wireless services, between providers can introduce inefficiencies in resource utilisation and worsen overall system performance. In such cases, resource pooling between independent service providers can be used to improve performance. However, for providers to agree to pool their resources, the arrangement has to be mutually beneficial. The traditional notion of resource pooling, which implies complete sharing, need not have this property. For example, under full pooling, one of the providers may be worse off and hence have no incentive to participate. In this paper, we propose partial resource sharing models as a generalization of full pooling, which can be configured to be beneficial to all participants. We formally define and analyze two partial sharing models between two service providers, each of which is an Erlang-B loss system with the blocking probabilities as the performance measure. We show that there always exist partial sharing configurations that are beneficial to both providers, irrespective of the load and the number of circuits of each of the providers. A key result is that the Pareto frontier has at least one of the providers sharing all its resources with the other. Furthermore, full pooling may not lie inside this Pareto set. The choice of the sharing configurations within the Pareto set is formalized based on bargaining theory. Finally, large system approximations of the blocking probabilities in the quality-efficiency-driven regime are presented

The Lacing Dermatotraction Suturing Technique

Introduction: Hailing from a tertiary government-aided center, infected surgical wounds varying from diabetic foot and necrotizing fasciitis to surgical site infection are by far the most common cluster of cases encountered in our practice. Due to an overall lack of patient education on wounds, most of these patients present late, necessitating extensive debridement and tissue loss. Aim and Objective: To describe the lacing dermatotraction technique and to study its application in aiding early secondary closure of infected surgical wounds. Material and Methods: An interventional Study was conducted at VICTORIA Hospital, Bangalore, from February 2020 to October 2021. Fifty-four patients with Infected wounds were debrided until healthy margins were obtained, followed by applying the shoelace tension lacing suture. This consisted of an infant feeding tube running under loops of prolene fixed 1 cm away from the edge of the wound. One end of the IFT is anchored to the skin, and the other is held in position with single throws of no-1 silk suture, which can be loosened at the next sitting for adequate wound exposure, which aids in better debridement. The tension suture is again tightened to attain the maximal possible wound approximation.   Thus, constant traction on the skin edges creates progressive closure until secondary closure is achieved. Results: 54 Patients were enrolled, consisting of 8 amputation stump infections, 11 diabetic foot, 14 disarticulations, five bed sore, 12 fasciotomies, three mastectomy flap necrosis, and one traumatic avulsion. There were 38 males and 16 females, with a mean age of 53.4 years. The mean duration of the wound at presentation was 17 days, and they were subjected to an average of 11 days of debridement. Mean wound dimensions - length= 11.02cm, breadth=4.86cm and area = 53.55 cm2. On applying the lacing, the wounds were debrided for an average of 8.85 days with 2.9 tightening. Secondary closure was achieved in 45 (83.33%) patients,. Conclusion: The lacing technique is inexpensive and safe to achieve early secondary closure of infected wounds. It avoids the need for skin grafts, reducing the need for anesthesia, hospital expenditure, and duration of hospital stay of patients.