Photographs from hardened unstained specimens.
The disease often starts near the stump of a carious tooth, in which case infiltration and erosion begin promptly and progress rapidly. Epithelioma of the tongue has been known to follow along the obliterated track of the thyrolingual duct, and in this way to bring about a perforating ulcer.
Epithelioma of the esophagus is a common cause of stricture of this passage-way. It leads to ulceration, and usually to perforation into the trachea or some other cavity or passage (i. e., a bloodvessel). In the larynx the disease is well known, and gives rise to intense and finally fatal symptoms, but has been dealt with successfully by radical operations for extirpation of the entire organ. (See [Chapter XLI].)
Fig. 89
Epithelioma of forehead and eyelid. (Neisser.)
Fig. 90
Epithelioma of lip. (Neisser.)
Occurring upon the scrotum, epithelioma has been called chimney-sweeper’s cancer, or soot-warts, and has been ascribed to the irritation of foreign material. Ulceration and infection of the inguinal nodes usually proceed rapidly and disastrously. It is believed also that tar and paraffin may produce similar irritation, and paraffin cancer has been described by various writers. It usually occurs upon the scrotum.