RESUMEN
PURPOSE: Evaluate the usefulness of diffusion-weighted spatiotemporally encoded (SPEN) methods to obtain apparent diffusion coefficient (ADC) maps of fibroglandular human breast tissue, in the presence of silicone implants. METHODS: Seven healthy volunteers with breast augmentation were scanned at 3 Tesla (T) using customized SPEN sequences yielding separate silicone and water (1) H images in one scan, together with their corresponding diffusion-weightings. RESULTS: SPEN's ability to deliver multiple spectrally resolved images in a single scan, coupled to the method's substantial robustness to magnetic field heterogeneities, served to acquire ADC maps that could be freed from contributions that did not belong to fibroglandular tissue. CONCLUSION: SPEN-based sequences incorporating spectral discrimination and diffusion-weighting enable the acquisition of reliable ADC maps despite the presence of dominant signals from silicone implants, thereby opening new screening possibilities for the identification of malignancies in breast augmented patients.
Asunto(s)
Mama/diagnóstico por imagen , Imagen de Difusión por Resonancia Magnética , Siliconas/química , Adulto , Artefactos , Mama/cirugía , Implantes de Mama , Femenino , Voluntarios Sanos , Humanos , Aumento de la Imagen/métodos , Interpretación de Imagen Asistida por Computador/métodos , Campos Magnéticos , Persona de Mediana Edad , Modelos Estadísticos , Fantasmas de Imagen , Prótesis e Implantes , Agua/químicaAsunto(s)
Neoplasias de la Mama , Mama/patología , Imagen por Resonancia Magnética/métodos , Mastectomía Segmentaria/métodos , Tumor Filoide , Anisotropía , Neoplasias de la Mama/patología , Neoplasias de la Mama/cirugía , Femenino , Humanos , Mamoplastia/métodos , Mamografía/métodos , Persona de Mediana Edad , Tumor Filoide/patología , Tumor Filoide/cirugía , Resultado del Tratamiento , Ultrasonografía Mamaria/métodosRESUMEN
Stromal tumors of the rectum are rare. The most common symptoms are rectal bleeding, pain, constipation and obstruction. A case report of a 61 years old female admitted with acute bleeding due to malignant stromal tumor of the rectum is described. Upon admission the clinical and laboratory findings necessitance blood transfusion. Preoperative assessments revealed a large tumor located in the rectal wall with extension to the adjacent tissues. The histologic features of needle biopsy was compatible with gastrointestinal stromal tumor. Abdominoperineal excision of the rectum was performed. The definitive histological examination showed a gastrointestinal stromal tumor (GISTs), spindle cell type with mucosal invasion, vast necrosis and highly mitotic activity. The tumor cells coexpressed CD34 and smooth muscle actin and were negative for staining desmin and S-100 protein. Adjuvant chemotherapy was given. The patient died 7 months after the operation due to widespread metastases. We decided to describe a rare malignant stromal tumor of the rectum with uncommon clinical presentation.