Intraosseous lipoma in the ulna and radius of a two-year-old Leonberger

Abstract

This report describes a case of intraosseous lipoma in a two-year-old Leonberger. The dog was presented with a history of ten month lameness in the right forelimb. A massive swelling from the elbow to the carpus of the right forelimb was visible. Treatment with anti-inflammatory medications by the local veterinarian for ten months was unsuccessful and the dog was presented at the university clinic. Radiographic images showed that the diaphyseal part of the ulna was affected by extensive cyst-like osteolysis. Furthermore, the distal metaphysis of the radius showed cyst-like osteolytic changes. The soft-tissue mass and parts of the ulna periosteum were surgically resected. Histopathological analysis of the mass in combination with clinical, surgical and radiographic findings was diagnostic for an intraosseous lipoma. The dog had a good long-term outcome as it was free of any signs of recurrence at the follow-up examinations performed after 18 months and after five years. To the authors' knowledge, this is the first description of intraosseous lipoma in a dog.

Infiltrative laryngeal lipoma in a Yorkshire Terrier as cause of severe dyspnoea

“…They are considered to be benign because they do not metastasize (1). However, infiltration of muscle, fascia, and occasionally bone is reported (1,5,24,31). In the present case mature fat cells in all planes up to the margins of the mass were identified histopathologically.…”

Mandibular infiltrative lipoma in a mixed breed dog

“…CT is a good imaging modality to assess the extent of infiltrative disease as it has excellent spatial resolution and provides cross-sectional images without superimposition (McEntee and others 2001). The adipose tissue in infiltrative lipoma has lower attenuation (typically less than −20 HU), which contrasts well with the surrounding muscle on CT images (Lamagna and others 2012, Nakladal and others 2012). Irregular shape of the mass, partial or complete ill-defined margins and the linear hyperattenuating striations relative to the surrounding fat on CT images were considered parameters that favoured a diagnosis of infiltrative lipoma (Spoldi and others 2017).…”

“…Irregular shape of the mass, partial or complete ill-defined margins and the linear hyperattenuating striations relative to the surrounding fat on CT images were considered parameters that favoured a diagnosis of infiltrative lipoma (Spoldi and others 2017). Therefore, in cases of suspected infiltrative lipoma, CT should be considered prior to surgery to allow assessment of extent of local infiltration allowing planning for wide resection (Lamagna and others 2012, Nakladal and others 2012). MRI is another cross-sectional imaging modality capable of assessing the local invasiveness (Nakladal and others 2012).…”

“…Therefore, in cases of suspected infiltrative lipoma, CT should be considered prior to surgery to allow assessment of extent of local infiltration allowing planning for wide resection (Lamagna and others 2012, Nakladal and others 2012). MRI is another cross-sectional imaging modality capable of assessing the local invasiveness (Nakladal and others 2012). …”

Bilateral hamartomatous medullary lipoma within the nasal turbinate bones in a cynomolgus monkey (<i>Macaca fascicularis</i>)

“…The tumor of the nasal turbinate is an extremely rare event in humans [1, 22]. In animals, intraosseous lipomas have been detected only in the long bones [25]. Recently, we encountered a tumor-like lesion in the nasal turbinate bone of a cynomolgus monkey ( Macaca fascicularis ).…”