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The extremely fœtid odour which pervades the room or even the house the patient occupies, is usually sufficient to suggest the diagnosis of cancrum oris. The odour must not be mistaken for that due to decomposition of sordes on the teeth and gums of a debilitated patient. The prognosis is always grave in the extreme, the main risks being general toxæmia and septic pneumonia.

Bacterial varieties of gangrene. Pathology clinical varieties Acute infective gangrene; Malignant œdema; Acute emphysematous or gas gangrene; Cancrum oris, etc. Bed-sores: Acute; chronic. Gangrene or mortification is the process by which a portion of tissue dies en masse, as distinguished from the molecular or cellular death which constitutes ulceration. The dead portion is known as a slough.

Cancrum oris, scarlet fever, burns, scurvy, etc., are occasional causes that have been mentioned, the atresia in these instances taking place at any time of life. Anomalies of the Lips. The aboriginal tribes are particularly noted for their large and thick lips, some of which people consider enormous lips signs of adornment. We have in English the expression, "pulling a long lip."

Only in the early stages and when the infection is limited are local measures successful in arresting the spread; in more severe cases amputation is the only means of saving life. #Cancrum Oris# or #Noma#. This disease is believed to be due to a specific bacillus, which occurs in long delicate rods, and is chiefly found at the margin of the gangrenous area.