OBJECTIVES/HYPOTHESIS Examine a protective crumple zone effect of paranasal sinuses and nasal cavity on skull base fractures. STUDY DESIGN Randomized-control, cadaveric study. METHODS In the experimental group (n = 4), the nasal cavity and bilateral sinuses of cadavers were obliterated with bone cement, whereas the control group (n = 4) had native sinus architecture. Increasing frontal, gla...

[1] The observed differences between complex craters and multi-ringed basins are described and a combined ‘‘transient cavity/displaced zone/melt cavity’’ model is explored to account for the observations. In this ‘‘nested melt-cavity model’’, the increasing influence of the percentage of the target undergoing impact melting at the sub-impact point with increasing size (the differential melt sca...

An analysis is presented to estimate the perturbation of morphology-dependent optical resonances (MDRs) of spherical dielectric cavities due to acceleration. In the model, the optical cavity is attached to a rigid base that is accelerating. Hertz contact theory is used to describe the contact surface between the base and the sphere, and the Navier equation is solved to obtain an expression for ...

abstract background: invasive fungal infection is an opportunistic infection caused commonly by mucoraccae and aspergillus. it mostly occurs in patients with underlying disease. since it has a high mortality and morbidity rate, considering a treatment strategy seems necessary.   objective: since there has not been a clear protocol for treating these patients, we decided to establish a protocol ...

BACKGROUND The expansion of endoscopic endonasal skull base surgery has resulted in an increased demand for reconstructive options. Reconstruction with vascularized tissue has proven indispensable for reliably separating the cranial contents from the paranasal sinuses following extended endoscopic endonasal approaches (EEA). The introduction of the Hadad-Bassagasteguy flap (vascular pedicle nas...

chondromas are benign tumors that may be found in many parts of the body. among intracranial neoplasms, tumors of cartilaginous origin are rare. it has been shown that most of these tumors arise from the skull base. their occurrence in other parts of the intracranial cavity is unusual. chondroma of falx is a rare neoplasm. in this report we introduce a case of falcine chondroma arose from front...

BACKGROUND Epithelioid hemangioendothelioma (EHE) is a rare vascular tumor that frequently occurs in soft tissues. Patients suffer from local recurrence and remote metastasis because of its malignant potential. Here, we present a rare case of EHE that originated from nasal cavity and invaded intracranially through the anterior skull base. CASE DESCRIPTION This is a 27-year-old woman who prese...

OBJECTIVES Defects after endoscopic expanded endonasal approaches (EEA) to the skull base, have exposed limitations of traditional reconstructive techniques. The ability to adequately reconstruct these defects has lagged behind the ability to approach/resect lesions at the skull base. The posteriorly pedicled nasoseptal flap is our primary reconstructive option; however, prior surgery or tumors...