Mesenchymal-epithelial interactions are essential for the development of the male reproductive tract. Tissue recombination experiments have been used to define the characteristics of these interactions. When mesenchyme, embryonic connective tissue, is recombined with epithelium from another organ an instructive induction may occur in which the developmental fate of the epithelium is altered. In...

A case of yolk sac tumor in a nine-month-old girl is presented. Vaginal hemorrhage was observed during the patient's check-up at the Bjelovar Children's Outpatient Clinic. The patient was referred to the Department of Pediatrics at the Zagreb University Hospital, where an endodermal tumor of the vaginal yolk sac was diagnosed. The patient underwent surgery, followed by chemotherapy. She is now ...

BACKGROUND Recent articles have published guidelines regarding the role of endoscopic surgery in the removal of frontal sinus osteomas. These guidelines recommend the endoscopic approach for small osteomas but recommend an osteoplastic flap for larger tumors. This study presents a series of endoscopically resected tumors both large and small. METHODS Retrospective chart reviews were performed...

introduction: ectopic tooth eruption may result owing to one of 3 processes: developmentaldisturbance, iatrogenic activity, or pathologic process, such as a tumor or a cyst. in rare cases, occlusion of the sinus ostia may predispose a patient to develop a maxillary sinus mucocele. when the maxillary sinus is invaded, symptoms usually occur late in the process.   case report: a 17 years old boy ...

The P19 embryonic stem (ES) cells are derivatives of the inner cell mass of a mouse blastoderm, are multipotent and can give rise to all three germ layers [1]. They are anchorage-independent, display no contact inhibition, and are tumorigenic [2]. The P19 ES cell line was originally derived from a teratocarcinoma in C3H/HE mice, produced by grafting an embryo at 7 days of gestation to the teste...

PURPOSE The purpose of this study was to report the case of a female patient who had a giant cell tumor in the paranasal sinus during childhood, and while undergoing multiple resection surgeries experienced optic atrophy in both eyes. CASE PRESENTATION This study involved a 35-year-old woman who was previously diagnosed with a giant cell tumor of the paranasal sinus bone at age 13. A CT scan ...

During vertebrate gastrulation, both mesodermal and endodermal cells internalize through the blastopore beneath the ectoderm. In zebrafish, the internalized mesodermal cells move towards the dorsal side of the gastrula and, at the same time, they extend anteriorly by convergence and extension (C&E) movements. Endodermal cells showing characteristic filopodia then migrate into the inner layer wi...