Feline – Male Domestic Short Hair

Species: Feline

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.

Low Magnification View of Lesion (2X)
Higher Magnification View of Lesion (20X)
Click here for the IDEXX Pathology Report on this case.

Microscopic Description:

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.

Interpretation:

Subcutaneous tissue: Angiolipoma

Comments/Pathogenesis:

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).

Reference/Additional Information:

Skin Diseases of the Dog and Cat: Clinical and Histopathologic Diagnosis, 2nd ed. p769. 2005

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