Elephantiasis is met with in all parts of the world, but much more frequently in tropical climates, especially about the West Coast of Africa, Brazil, the West Indies, and particularly India, and to less extent in Mediterranean regions and Arabia. In our own country, and also in Europe, it is not common. It rarely occurs before puberty. Heredity has no influence, nor is it contagious. It is commonly observed among the poor and neglected.
The immediate cause of the disease is to be found in inflammation and obstruction of the lymphatics. This obstruction is, according to late investigations, probably due to the presence in the lymphatic vessels of the parasite filaria and its ova. The filaria—a microscopic thread-worm—has been found in large numbers adhering to the walls of the lymphatics and blood-vessels, but is discoverable only during certain hours of the day. The parasite has also been found in lymph-scrotum, a disease closely related to, if not identical with, elephantiasis.
The great mass of the growth in the disease is made up of hypertrophic connective tissue and connective-tissue new growth. All parts of the skin and the subcutaneous tissues share in the hypertrophy. Papillary enlargement is usually a marked feature. The lymphatic glands are swollen and enlarged and the lymphatic vessels prominent. There is marked oedematous infiltration, lymphatic in character. As a result of pressure, the glandular structures of the skin are atrophied or destroyed, the fat atrophied, and the muscles degenerated. The walls of the blood-vessels are thickened.
In well-developed cases of elephantiasis the symptoms are so characteristic that the disease is readily recognized. Recurrent attacks of erysipelatous inflammation of the leg or genitalia will point, with probability, to a development of the disease, even before marked hypertrophy or the clinical features are developed. As regards the outcome of the disease, if the case comes under treatment in the early months of its development the process may be checked or held in abeyance; later, after the affection has become well established, but little more than palliation can be effected.
The inflammatory attacks are to be treated with rest in bed, hot or cold applications, lead-water, and similar measures. Quinine and iron internally, especially the former, are of value. Potassium iodide has also been well spoken of. Climatic change, especially in the early stages, may prove of marked advantage. After the acute symptoms of the erysipelatous attacks have subsided inunctions of iodine or mercurial ointments may be employed to soften the skin and promote absorption. The parts should also be firmly bandaged, either the roller bandage, or, preferably, one of rubber, being used. Instrumental compression and ligation of the main artery of the limb have been employed, at times, with diminution in the size of the part; also excision of a portion of the sciatic nerve was practised in a single case by Morton with reduction in the size of the limb, but these methods of treatment are not to be recommended. Lately, the use of the strong, constant current has been extolled as having a beneficial effect. Elephantiasis involving the genitalia is, if the disease is well advanced, to be treated by the knife, amputation of the parts being practised.
Dermatolysis.
Dermatolysis consists of a more or less circumscribed hypertrophy of the cutaneous and subcutaneous structures, characterized by softness and looseness of the skin and a tendency to hang dependently. It may be slight or extensive, and may be limited to a certain region or show itself simultaneously in several different parts. The integument is thickened, bulky, superabundant, and to a greater or less extent hangs down in folds. The hypertrophy is general over the area affected; the glandular structures, connective tissue, muscular fibres, pigment, and the subcutaneous areolar tissue share in the process. The surface is usually soft and pliable to the touch, but is uneven, in consequence of the hypertrophy of the follicles and the natural folds and rugæ. As a result of the increase in pigment the skin is more or less brownish in color. The tissues may develop to an enormous size, and the redundant parts may hang down in several folds, overlapping one another and forming a cloak to the parts below.
Dermatolysis may be congenital or may not develop until after puberty. It is a simple hypertrophy involving the integument and all its component parts, especially the subcutaneous connective tissue. The causes which bring about this condition are not known. It appears to be closely allied to molluscum fibrosum, the two diseases sometimes occurring together. It is not malignant, but its presence impedes locomotion and its weight is a discomfort.
The affection is classified under the head of elephantiasis by German writers, but the clinical features and course of the two diseases are entirely different. Elephantiasis telangiectodes is a term that has been given to a form of simple hypertrophy of the skin in which a marked new growth of vascular tissue takes place. In connection with this disease mention may be made of the condition characterizing the so-called rubber or elastic-skin man. In this condition there is no hypertrophy. The mobility and elasticity of the skin are probably due to a peculiar and abnormal looseness of the subcutaneous areolar tissue. It is to be looked upon as a congenital deformity. The treatment of dermatolysis is by excision when this operation is practicable.