It is filled with material which possesses partly edematous, partly fleshy, and partly bony properties.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
They are soft, edematous, and hot at first and contain a serous or blood-tinged fluid.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
They are apparently of traumatic origin, such as tying the tail fast while milking or shaving it too closely while trimming for show purposes, and usually contain bloody or gelatinous material within, or, again, they may be strongly edematous throughout.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler