The characteristic masses present both as delicate roundish flakes, isolated, not larger than a pinhead, and as confluent patches several times as large and more irregular in outline. These masses under microscopic inspection are seen to be composed of the filaments and spores of a confervoid parasitic plant, the Oïdium albicans, enclosing altered epithelia in various conditions. This parasitic growth does not become developed upon healthy mucous membrane with normal secretory products. Acidity of the fluids and exuberance of epithelium are the requisites for its production, whatever be the cause. The acidity of the fluids irritates the mucous membrane upon which they lie. This irritation induces abnormal proliferation of epithelium, upon which the spores of the cryptogam then germinate. Dissociated epithelial cells become proliferated at the surface of the mucous membrane, between which and upon which both free and agglutinated spores accumulate. From these spores sprout out simple and ramified filaments in compartments containing moving granular elements. (For the minute detailed anatomy of these filaments and spores the reader is best referred to Robin's work on Vegetable Parasites.)
It may suffice here to mention that the filaments are sharply-defined tubercles, slightly amber-tinted, of a mean diameter of between four and three millimeters, simple while immature and branched when fully developed. These tubules are filled with link-like groups of elongated cells in compartments, giving them an appearance of regular constriction at the junctions of adjoining groups of cells. Surrounding these tubules are groups of spheroid or slightly ovoid spores from five to four millimeters in diameter. Each spore contains one or two granules and a quantity of fine dust. This cryptogamic growth is developed in the proliferated cells of epithelium. The filaments in their further growth separate the epithelia, and even penetrate them. Thence they penetrate the mucous membrane and the submucosa (Parrot).
The mucous membrane beneath the growth is red, smooth, and glistening. Papillæ are sometimes prominent. It is not excoriated unless the growth has been removed with some violence, when, as noted, it may bleed slightly. Duguet and Damaschino have recently encountered cases associated with a special ulceration of one of the palatine folds; the former in enteric fever, the latter in a primitive case. The growth is quickly reproduced after removal—even within a few minutes when the secretions are very acid.
The glossal mucous membrane is usually the tissue first involved, the specks being more numerous at the tip and edges of the tongue than at its central portion. The glands at the base of the tongue may become invaded. From the tongue extension takes place to the lips, the cheeks, the gums, and the palate, hard and soft. The growth is especially prolific in the folds between lips and gums and between cheeks and gums. Sometimes the parts mentioned become involved successively without actual extension. In several recently reported instances occurring during enteric fever,8 the affection began on the soft palate, tonsils, and pharynx, and then progressed anteriorly toward the tongue, the cheeks, and the lips.
8 Duguet, Soc. Méd. des. Hôp., Mai 11, 1883; Rev. mens., Juin 1, 1883, p. 187.
But there is no limitation of the disease to these structures. The growth may cover the entire mucous membrane of the mouth. From the mouth it may reach the lateral walls of the pharynx, and in rare instances the posterior wall of the pharynx. The product is said to be more adherent on the pharynx (Reubold) than in the mouth. From the pharynx it may reach the epiglottis, and even the larynx (Lelut), in which organ it has been seen upon the vocal bands (Parrot). It has never been observed in the posterior nares or at the pharyngeal orifice of the Eustachian tube. It flourishes best, therefore, upon squamous epithelium. In infants much reduced, Parrot has seen ulceration in the neighborhood of the pterygoid apophyses, but attributable to the cachectic state of the child, and not to the disease in the mouth.
In many cases—in as large a proportion as two-thirds, according to some observers—the oesophagus becomes invaded, either in irregular longitudinal strips or in rings, in all instances (Simon) terminating a little above the cardia. In exceptional cases the entire mucous surface of the oesophagus may be covered with the product (Seux). It has been seen in the stomach (Lelut, Valleix), and is even said to be developed there (Parrot), presenting as little yellow projections, isolated or contiguous, from the size of millet-seeds to that of peas, and usually located along the curvatures, especially the smaller curvature and cardia (Simon).
In instances still more rare it is found in the intestinal canal (Seux), even at the anus (Bouchut, Robin), and thence upon the genitalia. In a child thirteen days old, Parrot found it in the pulmonary parenchyma at the summit of the right lung, where it had probably been drawn by efforts of inspiration.
The nipple of the nurse often becomes covered with the growth (Gubler, Robin, Trousseau, Simon).
SYMPTOMATOLOGY.—In infants the earliest symptom is distress during nursing, the nipple being seized repeatedly, and as frequently released with cries of pain and disappointment. This cry is hoarse when the vocal bands are involved.