The microscopical and immunohistochemical features of a rare cutaneous
leiomyoma in a cat are described. The principal characteristics of th
is tumour were multiple bundles of smooth muscle, either discrete or c
onjoined, with numerous collagen fibres between the muscle cells, and
osteoid metaplasia. The tumour was designated a piloleiomyoma as it wa
s considered to have arisen from the arrector pili muscles. (C) 1995 A
cademic Press Limited