<ul class="categoris_journal" style="width: 100%;">
<?php
if (is_single()) {
$cat = get_the_category();
$cat = $cat[0]->cat_ID;
$currentCat = '¤t_category='.$cat;
}
wp_list_categories('show_count=0&orderby=term_group&title_li='.$currentCat);
?>
</ul>