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Introduction Infiltrative lipomas are uncommon tumors reported in a variety of species, with dogs and humans comprising the most reported cases. 1 – 9 Clinically, infiltrative lipomas present as poorly delineated masses that can interfere
Summary
Medical records of 15 dogs with infiltrative lipoma, 1 of which had 2 lesions, were reviewed. Median age of affected dogs was 6.0 years, and median weight was 30.5 kg. The ratio of females to males was 4:1. Eight of the dogs were Labrador Retrievers. In 8 dogs, the lesions had previously been excised. There was not any apparent site predilection. Excision was the only treatment in all 15 dogs, and follow-up information was available for all dogs. Two dogs, each of which had 1 tumor, were euthanatized immediately after surgery, because the tumor could not be completely excised. Of the remaining 14 tumors, 5 (36%) recurred. Median time to recurrence for these 5 tumors was 239 days (range, 96 to 487 days). By means of Kaplan-Meier analysis, the percentage of dogs disease free 1 year after surgery was calculated to be 67%.
mainstay of treatment. 2 Subcutaneous lipomas of the horse can be classified as encapsulated or infiltrative. 3 , 4 Infiltrative lipomas, while less common in horses, can show extensive involvement of the soft tissues, including adjacent subcutaneous
where an infiltrative lipoma had been resected. Two years prior to examination, a lipoma that was approximately 4 cm in diameter was initially resected from the muscles at the caudal aspect of the right thigh. One year later, a palpable mass was
bands are present along the proximal and lateral aspects of the mass (up to 50 Hounsfield units) in contact with the biceps femoris muscle. An infiltrative lipoma was considered most likely on the basis of the CT findings. Figure 2— Same images as
spinal canal dorsally and from the left side. Presumptive diagnosis: Results of the neurologic examination were indicative of a thoracolumbar myelopathy. Neurodiagnostic imaging procedures revealed a mass (consistent with an infiltrative lipoma
identified. On the basis of the CT findings, a presumptive diagnosis of invasion of the vertebral canal by a tumor of adipose tissue was made. Benign neoplasia (infiltrative lipoma) was considered most likely because of the absence of CT criteria of
form loose adhesions to serosal surfaces. Infiltrative lipomas have been sporadically reported in dogs since their initial description in the veterinary literature. These neoplasms are similar to simple lipomas because of the well
– 5 Different types of lipoma tissue include simple lipomas, infiltrative lipomas, liposarcomas, and necrotic lipomas. 1 Simple lipomas are soft masses that are well demarcated and contain a thin capsule. 1 These can grow to be quite large but do
). In contrast, infiltrative lipomas are characteristically hypoattenuating, similar to usual subcutaneous fat, but are often associated with fine linear striations in adjacent muscle, indicating infiltration. 2 Limited CT descriptions of liposarcomas
