Myxoid liposarcoma: MRI features with histological correlation.

Background And Aims: Myxoid liposarcoma is classified in the group of sarcomas with adipose differentiation, which is the second most common group of sarcomas. However, myxoid liposarcoma is not a homogeneous entity, because the behavior and clinical course of these tumours can vary widely. This study aimed to describe the magnetic resonance imaging (MRI) features of myxoid liposarcomas and to determine whether the MRI features are associated with the histologic grade and can differentiate between low-grade and high-grade tumours and thus help in clinical decision making.

Myxoid liposarcoma: MRI features with histological correlation.

Background And Aims: Myxoid liposarcoma is classified in the group of sarcomas with adipose differentiation, which is the second most common group of sarcomas. However, myxoid liposarcoma is not a homogeneous entity, because the behavior and clinical course of these tumors can vary widely. This study aimed to describe the magnetic resonance imaging (MRI) features of myxoid liposarcomas and to determine whether the MRI features are associated with the histologic grade and can differentiate between low-grade and high-grade tumors and thus help in clinical decision making.

Visual Perceptual Skills in Attention-deficit/Hyperactivity Disorder Children: The Mediating Role of Comorbidities.

Significance: Attention-deficit/hyperactivity disorder (ADHD) has been commonly associated with alterations in visual perception. However, the individual behavior of visual perceptual skills and its relationship with different comorbidities remain unknown.

Purpose: The purpose of this study was to examine whether visual perceptual skills are impaired in children with ADHD, as well as to test the possible mediating role of comorbidities.

[Family picnodisostosis, report of a case after 10 years of follow-up].

Introduction: Pycnodysostosis is a rare disease secondary to a mutation in gen 1q21 that codifies the cathepsin K, proteolitic enzyme implicated in the metabolism of osteonectin, osteopontin and type I colagen. Its global incidence is around 1-1.7 cases per million, without genre prevalences, it is clinically caracterized by short stature, craneal deformities, «birds face» and bone fragility with pathological fractures tendency predominantly affecting long bones and occasionally vertebral pedicles.

[Diagnostic rentability of close pleural biopsy: Tru-cut vs. Cope].

Background: The prevalence of pleural effusion in Mexico is over 400 per 100 000 inhabitants. The etiology is infectious in 45.7% and neoplastic in 32.

[Clinical course of decompressive surgery for the treatment of lumbar stenosis].

Background: Several authors and publications have focused on comparing the clinical course of nerve root decompressive surgery, with or without fusion, to treat degenerative lumbar stenosis. However, there are not many reports analyzing the clinical course after decompressive surgery of a single nerve root (the most symptomatic one) comparing it with decompression of all the roots in a segment. This study intends to compare the clinical course after decompressing the most symptomatic lumbar nerve root with the release of multiple lumbar nerve roots to relieve neuropathic pain resulting from degenerative lumbar stenosis.

[Dynamic magnetic resonance imaging in the diagnosis of tumors and pseudotumors of the musculoskeletal system].

The greater temporal resolution provided in ultrafast dynamic contrast-enhanced magnetic resonance imaging sequences makes it possible to know the physiological phenomenon of the distribution of the contrast material through a time-signal intensity curve. Analyzing these curves enables us to deduce information relevant to the vascularization and perfusion of tissues, capillary permeability, and the interstitial space in the tumor. A steep curve with early washout in a space-occupying lesion greatly increases the possibility of histological malignancy, although this type of curve is not rare in benign lesions and relatively flat curves are not rare in malignant tumors.

[Prosthetic radial head for type III Masson fractures].

Introduction: The treatment of type III Masson radius head fractures is variable; there is not a clear solution.

Material And Methods: This study addresses the course of patients treated with radius head replacement for type III Masson fractures at ISSEMYM Medical Center, Ecatepec, Mexico.

Results: Four male patients were included; mean age was 34.

Collateral biliary circulation in portal hypertension syndrome.

Objective: to describe collateral circulation in the gallbladder wall in relation with portal hypertension syndrome, and to determine whether this syndrome is frequently associated portal vein thrombosis.

Methods: images were retrospectively reviewed for 9 patients with previously diagnosed portal hypertension syndrome, in whom ultrasound results suggested the presence of varices of the cystic vein.

Results: four patients showed signs suggesting portal vein thrombosis.