esophageal cancer is the ninth most common malignancy.the incidence of esophageal cancer varies greatly among regions of the world and occurs at a high frequency in asia and northern iran. we report the case of an 80-year-old man with esophageal squamous cell carcinoma who initially presented with a metastatic scalp lesion. esophagoscopy was performed and a lesion was located in the mid-portion...

Glycogenic acanthosis of the esophagus is a common benign entity characterized by multifocal plaques of hyperplastic squamous epithelium with abundant intracellular glycogen deposits (1). At esophagoscopy these lesions appear as slightly raised grey-white plaques which are usually 2-10 mm in diameter and may be confluent. Although they may involve any segment, the literature suggests that are m...

A 48-year-old man presented with retrosternal pain after eating. This problem had persisted for about 7 days. The pain typically disappeared within a few minutes but recurred every time the patient tried to eat. No dysphagia, hematemesis, melena, or weight loss was observed. Upon esophagoscopy, several black lesions were observed. They were scattered throughout the middle esophagus (Fig. 1A). P...

this study proposes a new linear approximation for solving the dynamic response equations of a rocking rigid block. linearization assumptions which have already been used by hounser and other researchers cannot be valid for all rocking blocks with various slenderness ratios and dimensions; hence, developing new methods which can result in better approximation of governing equations while keepin...

this study proposes a new linear approximation for solving the dynamic response equations of a rocking rigid block. linearization assumptions which have already been used by hounser and other researchers cannot be valid for all rocking blocks with various slenderness ratios and dimensions; hence, developing new methods which can result in better approximation of governing equations while keepin...

OBJECTIVES (1) To describe clinical and radiologic findings in patients with esophageal foreign bodies. (2) To examine the sensitivity and specificity of history, physical examination, and radiologic studies in children with suspected foreign body ingestion. METHODS A retrospective cohort study was performed evaluating all children who underwent esophagoscopy for suspected foreign body ingest...

The purpose of this research was to evaluate the nonlinear dynamic response of rigid and semi-rigid steel frames under Far-Fault Earthquake Records. Accordingly, the fragility curve of the moment frames with rigid and semi-rigid connections was determined. Considering the analytical knowledge of structures in the past, the analysis and design of steel frames based on the assumptions of rigid or...