Book 8
4
A blow on the cranium involves two dangers; either a split bone or a depressed fracture. If the bone is split, the edges may remain in close contact, either because one margin overrides the other, or because they have become closely interlocked again. Hence it follows that humour collects on to the cerebral membrane but has no means of exit, and so irritates it, exciting severe inflammation. But when there is a depressed fracture, the bone presses on the cerebral membrane and sometimes also sharp points like needles from the fractured bone cause irritation. Cases like this require assistance, with as little loss of bone as possible. Therefore if one edge overlies the other, it is sufficient to cut away the overlying edge with a flat chisel; when this is removed a gap is left wide enough for treatment. But when the fractured edges have become interlocked, a hole should be made with a trepan at a finger's breadth to one side; and from this two cuts should be made with the chisel to the fissure, in the form of the letter V, with the apex at the hole and the base at the fissure; but if the fissure is a lone one, similar curs should be made from a second hole. And thus there is no concealed cavity in that bone, and a way out is given freely to all harmful material within. Even when the fractured bone is depressed, it need not all be excised. But whether completely broken off and separated from the rest, or still attached by a small portion to the skull around, the fragment should be separated by the chisel from the sound bone. Next, in the depressed fragment, close to the groove which we have just made, holes are to be bored as well; two when the damage is of small extent, three when larger, and the intervening partitions must be cut through. Next the chisel is to be so used on each side of the said groove, that a crescent-shaped gap is made with its convexity on the side of the fragment, and its horns directed towards the intact bone. Then if there are any detached fragments which can be easily removed, they are to be seized with forceps made for the purpose and particularly the pointed fragments which are irritating the membrane. If this cannot be done easily, the plate which I have suggested as a guard of this membrane is to be passed underneath in order that all pointed fragments which project inwards may be cut away over the plate, and any depressed bone is to be raised by means of the same plate. This method of treatment ensures that fragments still attached become consolidated; and detached fragments come away in course of time under the dressing without any pain; and by that treatment there is left a gap in the skull large enough for the extraction of matter; and the brain is better protected by leaving the bone than if it had been excised. After this, that membrane should be sprinkled with strong vinegar, in order that any bleeding from it may be checked, or any collection of clot which remains inside may be broken up. Then the same plaster, softened as described above, should be put on the membrane itself; and the rest of the dressing as before, ointment on the lint, and unscoured wool; the patient should be kept in a warm room; the wound dressed daily, even twice a day in summer.
