Biomedical subjects
Publications and source records attributed to Ligang Liu.
Benign mesenchymoma is an uncommon neoplastic disease and its occurrence in pharynx-esophagus is even more rarely reported. A successful case operation is reported. The origin of this tumor was in the pharynx-esophagus, and complete excision was achieved through a laterocervical approach.
Bronchogenic cysts occurring in the left ventricle are a medical rarity. One successfully operated case is reported herein. The location of the cyst was just between the epicardium and myocardium of the inferior left ventricular wall, adjacent to the apex of the heart. Complete excision was achieved through a left anterolateral thoracotomy without extracorporeal circulation.
OBJECTIVE: To investigate the results of skin sparing mastectomy and immediate breast reconstruction with transverse rectus abdomins musculotaneous (TRAM) flap or latissimus dorsi musculocutaneous flap plus placement of a mammary implant. METHODS: From June 1997 to June 2002, 11 patients were proven to have ductal carcinoma in situ or huge breast carcinoid by pathological examination. The site of the biopsy incision was around the areola. The patients underwent mastectomy with skin sparing by a circumareolar incision and immediate breast reconstruction with TRAM flap or latissimus dorsi musculocutaneous flap plus placement of mammary implant. Autogenous tissue was used to fill the skin envelop. The second stage operation of nipple-areola reconstruction was performed on the replaced skin. RESULTS: Eleven patients were followed up 1 month to 6 years. The operative result was good and all patients had no relapse. The reconstructed breast achieved good results in shape, colour, sensation, symmetry and incision scar. CONCLUSION: The skin sparing mastectomy and immediate autograft tissue breast reconstruction is an ideal reconstructive method for the patients with breast ductal carcinoma in situ or huge breast carcinoid in condition that there were strict operative indication and relapse can be prevented.
Recently, differential information as local intrinsic feature descriptors has been used for mesh editing. Given certain user input as constraints, a deformed mesh is reconstructed by minimizing the changes in the differential information. Since the differential information is encoded in a global coordinate system, it must somehow be transformed to fit the orientations of details in the deformed surface, otherwise distortion will appear. We observe that visually pleasing deformed meshes should preserve both local parameterization and geometry details. We propose to encode these two types of information in the dual mesh domain due to the simplicity of the neighborhood structure of dual mesh vertices. Both sets of information are nondirectional and nonlinearly dependent on the vertex positions. Thus, we present a novel editing framework that iteratively updates both the primal vertex positions and the dual Laplacian coordinates to progressively reduce distortion in parametrization and geometry. Unlike previous related work, our method can produce visually pleasing deformations with simple user interaction, requiring only the handle positions, not local frames at the handles.