Continuous decompression treatment of unicameral bone cyst in a small-breed dog: A case report.

Objective: To report the long-term outcomes of continuous decompression for repairing a unicameral bone cyst in a dog.

Study design: Case report.

Animal: A 1-year-old Maltese-Poodle mixed breed dog presented with left forelimb lameness.

Methods: A well-defined cyst in the left humeral condyle was detected on radiography and computed tomography. A lateral surgical approach revealed the cyst in the distal metaphysis of the left humerus. The attained cyst fluid and incisional biopsy led to the diagnosis of unicameral bone cyst. To prevent cyst expansion and recurrence, aspiration, open curettage, ethanol cauterization, and continuous decompression using introducer needles were performed.

Results: The dog recovered from surgery, and a Robert Jones bandage was retained for 2 weeks. The follow-up at 1 month showed resolution of lameness. At 12 months post-surgery, radiographs revealed increased cortical thickness and no recurrence of the cyst or lameness.

Conclusion: Continuous decompression using introducer needles could be used to repair unicameral bone cysts. Small diameter introducer needles were especially useful, as the lesion was located at the joint. The procedures described in this report could be applied before other salvage procedures to promote healing and prevent recurrence.