Subserosal, myometrial lymphatic cyst.
Keywords: lymphatic, cyst, equine, subserosal
This large structure was detected on transrectal palpation.
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Leiomyomas and leiomyosarcomas in the equine myometrium are usually reported as solid structures. However, this was presumed to be a cystic leiomyoma because of its size and location. Although cystic leiomyomas have not been reported in mares, they do occur in humans. Leiomyosarcomas are very rare, making that diagnosis unlikely.
On postmortem examination the massive multilocular cyst at upper left was seen. Histopathological examination by a veterinary pathologist revealed fibrosis surrounding the cysts but no evidence of neoplasia. Therefore this was presumed to be a large lymphatic cyst in an atypical site; myometrial and subserosal rather than endometrial.
References:
G. F. Hoffsis. 1986 Leiomyoma of the Uterus of a Mare. Can Vet J.27: 319–320.
H.M. Nelis et al 2013 Oviductal and uterine leiomyomata in mares. Vlaams Diergeneeskundig Tijdschrift. 82: 81-86
Low,S.C.A. and Chong, C.L 2004 A Case of Cystic Leiomyoma Mimicking an Ovarian Malignancy Ann Acad Med Singapore;33:371-4
Löfstedt, R.M.et al. 1987 Case report. Leiomyosarcoma in the uterus of a mare. Comp. of Cont. Educ. Pract. Vet. 9, 93-96
Berezowski.C, 2002 Diagnosis of a uterine leiomyoma using hysteroscopy and a partial ovariohysterectomy in a mare. Can Vet J. 2002 December; 43(12): 968–970.
