Cutaneous B-Cell Lymphoblastic Lymphoma.

B-cell lymphoblastic lymphoma (B-LBL) is a malignant neoplasm of immature B cells that accounts for only 10% of all cases of lymphoblastic lymphoma. Most commonly, B-LBL presents as bony lesions, but in rare cases, the disease manifests cutaneously. We present a case of simultaneous cutaneous and systemic presentation of B-LBL in an otherwise healthy 28-year-old man in which the lymphoblastic infiltrate stained positive for CD79a, Tdt, CD10, and CD20. A diagnosis of cutaneous B-LBL was made, and systemic work-up revealed widespread involvement of the skin, bone, and lymph nodes. Review of all currently described cases of cutaneous B-LBL with or without systemic involvement revealed that the most frequently positive tumor markers were CD79a (92.3%), Tdt (90.6%), and CD10 (83.3%). Systemic involvement of B-LBL was found in nearly half of all cases with cutaneous presentation.

Analysis of transplant rejection in rabbits aponeurosis.

OBJECTIVE: To study the feasibility of heterologous aponeurosis to close the abdominal wall of rabbits emphasizing the rejection process. METHODS: This project was approved by the Animals Care Committee of the Faculdade de Ciências Médicas da Santa Casa de São Paulo, and it was carried out at the Experimental Surgery and Technical Unit. Four red female rabbits exchanged abdominal wall aponeurosis with other four white male animals. Two rabbits just had it removed and replaced to be the control group for the healing process. Animals were evaluated once a day, and after 7 days they were sacrificed. Immunohistochemical analysis with CD20 and CD79 was done. RESULTS: The animals did not have cellulitis, abscess, hematoma, wound dehiscence or herniation. The graft site showed intense hyperemia. The histological analysis showed an inflammatory process with maturing myofibroblasts and collagen ranging from incipient to moderate. The number of vessels was reduced and the inflammatory cells were most plasma cells and macrophages. There were no morphological signs of acute rejection with aggressive vascular endothelial damage. The adjacent muscle showed signs of degeneration with inflammatory centralization of nuclei and cytoplasmic condensation. The immunohistochemical analysis (CD20 and CD79) showed that the inflammatory process was not mediated by lymphocytes. Mann-Whitney nonparametric test showed that the hypothesis of equality (p>0.05) should not be discarded. CONCLUSION: There were no postoperative complications (fistulas, dehiscence etc.) and the histological analysis showed nonspecific inflammatory process. The immunohistochemical analysis showed that the inflammatory process was not due to a possible rejection.

B-cell lymphoblastic lymphoma in the maxilla of a child: a rare case report.

Lymphoblastic lymphoma is a malignant neoplasia that originates from B or T lymphocyte precursors and rarely occurs in the mouth. The authors report a rare case of B-cell lymphoblastic lymphoma in the maxilla of a child. Clinical examination revealed facial asymmetry with a swelling of the right maxilla, covered by healthy mucosa and painful to palpation. Radiographic examination revealed a poorly defined radiolucent lesion. Based on the hypothesis of malignant neoplasia of hematopoietic origin, an incisional biopsy was performed. Histological examination revealed malignant neoplasia with proliferation of monomorphic, lymphoid cells. Immunohistochemical staining was positive for leucocyte common antigen (LCA), CD10, CD20, CD79, and terminal deoxynucleotidyl transferase (TdT). After the diagnosis of B-cell lymphoblastic lymphoma, the patient underwent chemotherapy, but died of leukoencephalopathy and demyelinization caused by high doses of methotrexate.