Abstract
The most common benign tumors of the mesenchyme are the lipomas. Benign fatty tumors can arise in any location in which fat is present. Fibrolipomas are characterised by fat modules. Most patients affected by such tumors are in the fifth or sixth decade of life. When very close to vital structures such as joints, they may cause functional limitations as well as pain. Osseous and chondroid metaplasia can infrequently manifest after chronic persistence. Given the rarity of this condition, a case of a big fibrolipoma of Hoffa's fat pad with osseous and cartilaginous metaplasia is reported. A 44-year-old woman presented with an enlarging soft mass on the right knee in the infrapatellar fat pad. After a thorough preoperative clinical and imaging examination, the mass was removed and sent to laboratory where the diagnosis was put. One year after surgery, both local and general condition of the patient were good and no signs of recurrence were found.
Highlights
The most common [1] benign tumors of the mesenchyme are the lipomas
Most are subcutaneously located [8]. They can manifest osseous and/or chondroid metaplasia over extended periods of time, causing additional functional problems and pain compression syndromes like the case we present here [9]
It has been suggested that a liposarcoma should be considered when a fatty subcutaneous tumor is more than 10 cm in diameter and has grown rapidly in recent months [18]
Summary
The most common [1] benign tumors of the mesenchyme are the lipomas It is unclear if a soft-tissue lipoma represents a benign neoplasm, a local hyperplasia of fat cells, or a combination of both processes. They may arise in any location in which fat is present, the majority found in the upper half of the body, the trunk and neck, though may develop in other sites such as the hand [2, 3]. Given the rarity of this condition, a case of a big fibrolipoma of Hoffa’s fat pad with osseous and cartilagenous metaplasia is reported
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