Category: E

A cyst filled with keratin, sebum, and skin debris that may form on the scalp, the back of the neck, or the axilla. It is benign but can be removed surgically. An innocuous nodule located beneath the skin’s surface, containing yellow, cheesy material. The terms “epidermoid cyst” and “sebaceous cyst” are frequently used interchangeably to…

An ovarian cyst or tumor lined with endometrial tissue, usually seen in ovarian endometriosis.  

A hollow tube attached to the end of the collimator apparatus of an x-ray tube. It limits the size of the beam, decreasing scatter radiation and increasing detail.  

Cyanosis induced by intestinal absorption of toxins or by certain drugs.  

The thin, calcified layer that covers the enamel crown of the tooth prior to eruption. Remnants that persist after decalcification of the tooth for microscopy are called Nasmyth’s membrane.  

A chart or graph in which the number of new cases of an illness is plotted over time.  

A noninvasive treatment for angina pectoris and congestive heart failure involving the use of inflatable cuffs on the patient’s legs to improve myocardial perfusion and increase cardiac output. Cuffs placed on the calves, lower thighs, and upper thighs are inflated sequentially during diastole when coronary artery filling occurs. The inflated cuffs increase diastolic central aortic…

A reflex cough induced by irritation in the ear that stimulates Arnold’s nerve.  

The production of corticotropin by nonendocrine tissue. This is usually but not always associated with a cancer such as a small-cell cancer of the lung. In some cases, the production site may not be found.  

The inner gyrus of the temporal lobe of the brain. It comprises the parahippocampal gyrus and the subicular cortex. In the entorhinal cortex, the five-layer structure of the ventral temporal cortex gradually merges into the single layer that is found in the dentate gyrus, the innermost edge of the temporal lobe. The entorhinal cortex receives…