[Maxillary ameloblastoma extending into the sinonasal tract].

Maxillary ameloblastomas can extensively expand into the paranasal sinuses or even the nasal cavity due to a slow growth pattern. Sinusitis is rarely the first tumor-related complaint. Due to the various growth forms of ameloblastomas the challenging histological differential diagnosis includes several other odontogenic as well as benign and malignant non-odontogenic tumors, e.

The diagnostic role of radioactivity in sentinel nodes in oral and oropharyngeal cancer.

Sentinel lymph node biopsy (SNB), using radioactive tracers, is a novel, interesting tool in the staging of patients with oral and oropharyngeal squamous-cell carcinoma (OOSCC), which could lead to a reduced rate of elective neck dissections. The aim of the study was to evaluate the ranking of measured radioactivity in the sentinel lymph nodes (SLNs) and to correlate these findings with histopathological results to assess the number of SLN being sufficient for exact staging of the neck. In 77 consecutive patients with T1-4 OOSCC clinically and positron emission tomography-staged N0, between 15 and 55 MBq of Tc- 99m-labeled albumin-microcolloids were injected peritumorally and 213 SLNs were excised by small skin incisions using a gamma probe 2-3 hours later.

The prognostic value of FDG PET in head and neck cancer. Correlation with histopathology.

Aim: The aim of the present FDG PET study was to evaluate the prognostic value of the standardized uptake value (SUVmax) of head and neck cancer (HNSCC) with respect to the chemotherapy response and tumor recurrence.

Methods: The FDG PET findings of 40 patients with HNSCC were compared with the final histopathology results after removal of the primary tumor and surgical neck dissection. The clinical T staging was based on clinical examinations and computed tomography was used for assessment of bone involvement.

[Sentinel lymphonodectomy as a staging method for head and neck cancer. Analysis of 70 patients].

Background: The excision of sentinel lymph nodes has a growing relevance in the diagnosis of oral and oropharyngeal cancer in cases of N0 necks. The validity of sentinel node biopsy (SNB) was examined as a single surgical staging tool.

Patients And Methods: Within the framework of a multi-modal treatment scheme, SNB without elective neck dissection was carried out on 70 previously untreated patients in the same session as the surgery for the primary cancer.

Sonography of the temporomandibular joint from 60 examinations and comparison with MRI and axiography.

Background And Objective: Establishing a diagnosis of temporomandibular joint disorder is mainly based on clinical assessment, functional examination, nuclear magnetic resonance imaging (MRI) and axiography. Sonographic examination was compared with MRI and axiography in assessing temporomandibular joint (TMJ) function in 55 patients.

Patients And Methods: Fifty-five patients with different TMJ problems were examined clinically, by means of axiography, sonography and some also by MRI.

Alpha 1-receptor-independent activation of protein kinase C in acute myocardial ischemia. Mechanisms for sensitization of the adenylyl cyclase system.

The activity of the adrenergic system plays an important role in the genesis of malignant arrhythmias and the spreading of the infarcted zone in acute myocardial ischemia. Acute myocardial ischemia induces an increased activity of adenylyl cyclase. This sensitization at the enzyme level as shown in the isolated perfused rat heart occurs rapidly after the onset of ischemia (5-15 minutes) and is rapidly reversible on reperfusion.