Breed: Domestic Short Hair
Age: 13 Years
Gender: Male, Neutered
Source/History: 10 x 10 cm mass in the left inguinal region, recently larger. At surgery there was a well-defined highly vascular mass with very loose fascial attachments. Sample is a section of the mass, so are borders irrelevant.Click here for the IDEXX Pathology Report on this case.
A section of soft tissue from the subcutaneous region is evaluated. The specimen is comprised of large, irregular vascular channels lined by flattened endothelial cells that contain red blood cells in their lumens. Surrounding the vessels there are multilobulated nodules of well-differentiated adipocytes supported by modest bands of fibrocollagenous tissue that occasionally are partially encapsulating the nodules. Individual adipocytes have abundant cytoplasmic lipid and small compressed nuclei. Mitoses are not seen. Inflammation is not present.
Subcutaneous tissue: Angiolipoma
Angiolipoma is a rare tumor with both endothelial and adipocytic components. It is a rare variant of the much more common lipoma. These tumors are benign and complete excision is curative. Some angiolipomas may have ill-defined microscopic borders and, in some cases, identifying the tumor margins may be difficult histologically (and clinically).
Skin Diseases of the Dog and Cat: Clinical and Histopathologic Diagnosis, 2nd ed. p769. 2005