Prevalence and characteristics of the aberrant anterior tibial artery: a single-center magnetic resonance imaging study and scoping review.

BACKGROUND: Planning surgical procedures of the lower leg benefits from considering the possibility of an aberrant anterior tibial artery (AATA), but previously published data on the frequency of this anatomic variant shows heterogeneity. We assessed the prevalence of AATA in a Latin American cohort using magnetic resonance imaging (MRI) and compared these with other studies reported in the literature. METHODS: We retrospectively included consecutive patients who had undergone multiplanar knee MRI at a radiology department in Lima, Peru. The MRI protocol included coronal T1 weighted, axial, sagittal and coronal proton density fat-saturated (PDFS) and sagittal T2 weighted images. Two experienced radiologists assessed all images and were blinded to each other's findings. The frequency of the AATA was compared to previous cohorts. A scoping review was undertaken to provide an overview of previously published data on the prevalence of ATAA. RESULTS: We analyzed 280 knee MRI examinations of 253 patients (median age 41 years (IQR 31-52), 53.8% male). The aberrant anterior tibial artery variant was present in 8 of 280 (2.9%) evaluated knees, resulting in a prevalence of 3.2% in our study population. The PDFS sequence in the axial or sagittal orientation was most effective to identify AATA. The frequency of AATA in the reviewed literature using different radiological modalities ranged from 0.4 to 6% (median 1%, IQR (0.5-2.3%). CONCLUSIONS: The AATA is a frequent vascular variant that can be detected by MRI in the preparation of invasive interventions of the lower leg.

Liposarcoma mixoide retroperitoneal gigante: A propósito de un caso / Giant Retroperitoneal Myxoid Liposarcoma: A case report

El Liposarcoma es el sarcoma retroperitoneal más frecuente. En el Perú sólo se conoce la frecuencia en el Instituto Nacional de Enfermedades Neoplásicas, donde representan el 33,7% de los casos de sarcoma retroperitoneal. Su crecimiento es lento y su sintomatología más frecuente es dolor abdominal inespecífico y aumento del perímetro abdominal. La tomografía computarizada (TC) brinda información vital en el diagnóstico. Reportamos el caso de un varón de 34 años que presentó un cuadro de 8 meses de duración caracterizado por sensación de tumoración abdominal, dolor abdominal y constipación. La TC de abdomen mostró signos de tumor retroperitoneal con pequeñas áreas de densidad grasa (-53UH). El diagnóstico anatomo-patológico fue Liposarcoma mixoide con áreas de desdiferenciación, lo que es infrecuente en la región retroperitoneal. Se analizan la localización retroperitoneal y sus características tomográficas. (AU)

Liposarcoma is the most common retroperitoneal sarcoma. In Peru is only known the frequency of the Instituto Nacional de Enfermedades Neoplásicas, where it accounts for 33.7% of retroperitoneal sarcomas. The growth of this tumor is low, and it is associated with non-specific symptoms, including abdominal pain and increase in abdominal waist. CT-scan provides vital information for diagnosis. We report the case of a 34 year-old male patient who presented with a 8-month history of abdmominal pain, constipation and feeling of an intra-abdominal mass. The CT-scan revealed signs of a retroperitoneal mass with fat tissue densities (-53UH). Pathological diagnosis was dedifferentiated myxoid liposarcoma, which is infrequent in the retroperitoneum. We analyzed the retroperitoneal location and CT-scan features of this tumor. (AU)