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Summary Twenty‐nine horses were examined over a period of 8 years and found to have cystic lesions in the stifle (14 cases) or pedal bone (15 cases). The lesions are described and illustrated with radiographs. In the stifle 12 lesions were found on the femoral condyles (11 medially and one laterally) and 10 were typical subchondral cysts. One lesion was observed in the tibia and 3 in the patella. Bone cysts were found unilaterally in the pedal bone (14 in the forelimbs and one in the hindlimb). All but 2 of the horses with lesions in the stifle or pedal bone were lame. The only treatment was rest. For the stifle lesions, the prognosis was reasonable for young horses but poor for those over 4 years of age; for the pedal bone lesions the prognosis was guarded. Trauma is advanced as the most likely major aetiological factor. Résumé En huit années, 29 chevaux furent trouvés porteurs de lésions kystiques du grasset (14 cas) ou de l'os podal (15 cas). Ces lésions sont décrites avec illustrations radiographiques. Au niveau du grasset, 12 cas intéressaient les condyles fémoraux (11 cas internes ou médians, 1 cas externe ou latéral) et 10 étaient des kystes sous cartilagineux typiques. Une lésion fut constatée au niveau du tibia et 3 au niveau de la rotule. Des kystes furent constatés d'un seul côté dans l'os podal (14 fois sur les antérieurs, une fois sur un postérieur). A l'exception de 2, tous ces chevaux porteurs de lésions du pied ou du grasset boitaient. Le seul traitement utilisé fut le repos. Le pronostic des lésions du grasset fut optimiste pour les jeunes chevaux, mais mauvais pour ceux âgés de plus de 4 ans. Pour les lésions du pied, le pronostic fut constamment réservé. On pense que le facteur étiologique le plus important est un traumatisme. Zusammenfassung Innert acht Jahren wurden 29 Fälle zystöser Läsionen in den Knochen des Kniegelenks (14 Fälle) und im Hufbein (15 Fälle) beobachtet. Die Veränderungen werden beschrieben und mit Röntgenbildern illustriert. Im Femur fanden sich 12 Zysten in den Kondylen (11 medial, eine lateral); dabei handelte es sich bei 10 Tieren um typische subchondrale Zysten. Eine Veränderung wurde in der Tibia, drei in der Patelle festgestellt. Zysten an der Basis des Hufbeins wurden unilateral in 14 Fällen vorn, ineinem hinten nachgewiesen. Nur zwei der Pferdegingen nicht lahm. Die einzige Behandlung bestand in Ruhe. Für die Knieläsionen war die Prognose einigermassen günstig bei jungen Pferden, ungünstig bei solchen über vier Jahren; die Prognose für Hufbeinzysten ist vorsichtig zu stellen. Traumen werden als warhrscheinlichster ätiologischer Faktor angesehen.

Ninety-five horses with sarcoids were subjected to three types of treatment: surgical excision (conventional or carbon dioxide laser), cryotherapy or local BCG vaccination. The type of treatment was selected on the basis of the size, location and clinical appearance of the tumours. The choice between conventional and laser excision was empirical. A successful outcome was obtained in 11 of 14 (79 per cent) of the horses treated by cryosurgery, 18 of 27 (67 per cent) treated by BCG vaccination, 18 of 22 (82 per cent) treated by conventional excision, and 20 of 28 (71 per cent) treated with a carbon dioxide laser. For both excision methods, rigorous measures were taken to avoid autoinoculation and to ensure a wide margin of normal skin. The probability of local recurrence after excision was significantly higher for large sarcoids and sarcoids which had previously failed to respond to treatment. In 10 of the 31 horses with remaining sarcoids, some or all of the untreated sarcoids were observed to regress spontaneously.

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BPV DNA is often detected in visibly normal skin around sarcoids, and there is a significantly greater probability for local recurrence when the surgical margins are positive for the presence of BPV DNA.