9 research outputs found
Adnexal masses: benign ovarian lesions and characterization - benign ovarian masses
Incidental adnexal masses are commonly identified
in radiologists’ daily practice. Most of
them are benign ovarian lesions of no concern.
However, sometimes defining the origin of a
pelvic mass may be challenging, especially on
ultrasound alone. Moreover, ultrasound not
always allows the distinction between a benign
and a malignant adnexal tumor.
Most of sonographically indeterminate
adnexal masses turn out to be common benign
entities that can be readily diagnosed by magnetic
resonance imaging. The clinical impact
of predicting the likelihood of malignancy is
crucial for proper patient management.
The first part of this chapter will cover the
technical magnetic resonance imaging aspects
of ovarian lesions characterization as well as the
imaging features that allow the radiologist to
correctly define the anatomic origin of a pelvic
mass. Next, the authors will go through different
benign ovarian entities and through the different
histologic types of benign ovarian tumors.
Finally the functional ovarian tumors and the
ovarian tumors in children, adolescents, young
females, and pregnant women will be covered.info:eu-repo/semantics/publishedVersio
Patterns of postictal cerebral perfusion in idiopathic generalized epilepsy: a multi-delay multi-parametric arterial spin labelling perfusion MRI study
The cerebral haemodynamic status of idiopathic generalized epilepsy (IGE) is a very complicated process. Little attention has been paid to cerebral blood flow (CBF) alterations in IGE detected by arterial spin labelling (ASL) perfusion magnetic resonance imaging (MRI). However, the selection of an optimal delay time is difficult for single-delay ASL. Multi-delay multi-parametric ASL perfusion MRI overcomes the limitations of single-delay ASL. We applied multi-delay multi-parametric ASL perfusion MRI to investigate the patterns of postictal cerebral perfusion in IGE patients with absence seizures. A total of 21 IGE patients with absence seizures and 24 healthy control subjects were enrolled. IGE patients exhibited prolonged arterial transit time (ATT) in the left superior temporal gyrus. The mean CBF of IGE patients was significantly increased in the left middle temporal gyrus, left parahippocampal gyrus and left fusiform gyrus. Prolonged ATT in the left superior temporal gyrus was negatively correlated with the age at onset in IGE patients. This study demonstrated that cortical dysfunction in the temporal lobe and fusiform gyrus may be related to epileptic activity in IGE patients with absence seizures. This information can play an important role in elucidating the pathophysiological mechanism of IGE from a cerebral haemodynamic perspective