RESUMO
In order to assess specificity and sensitivity of the prone scintimammography (PSM) in a large series with 99m-Tc MIBI, we performed a three-center study; 420 patients were studied; after mammography all the patients were submitted to PSM and biopsy and/or operation. PSM was considered positive if hot spot within the breast was observed. In palpable masses sensitivity was 0.98 and specificity 0.89, non palpable masses showed a sensitivity of 0.62 and a specificity of 0.91. When the cancers were stratified for T category the sensitivity was 0.28 in T1a 0.26 in the group of T1a carcinomas, 0.56 in T1b 0.95 in T1c and 0.97 T2 tumors. Physical factors such as attenuation. Compton scattering from chest, as well as biological factors have a role in breast tumor imaging. In the tumors smaller than 1 cm biological factors are probably involved too.
Assuntos
Doenças Mamárias/diagnóstico por imagem , Neoplasias da Mama/diagnóstico por imagem , Tecnécio Tc 99m Sestamibi , Adulto , Idoso , Biópsia , Neoplasias da Mama/patologia , Neoplasias da Mama/cirurgia , Reações Falso-Negativas , Reações Falso-Positivas , Feminino , Humanos , Mamografia , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Valor Preditivo dos Testes , Cintilografia , Reprodutibilidade dos Testes , Sensibilidade e EspecificidadeRESUMO
This retrospective, multiple-center study includes 172 PTFE (Gore-Tex) and 35 umbilical vein grafts (Bio-graft) used for femoro-popliteal bypass grafting. The one-year patency rate was approximately 63% in both groups. Until further experience is accumulated, autogenous saphenous vein should probably be the first choice for femoro-popliteal bypass grafting. Prosthetic grafts should preferably be used when the saphenous vein is absent or insufficient.