Tumors and tumor-like lesions of infrapatellar fat pad and surrounding tissues: A review of the literature

Abstract

The infrapatellar fat pad (IFP) is an intracapsular structure with critical importance both mechanically and endocrinologically. Its dysfunction must be considered while clinically investigating the symptoms arising from the knee joint. Infrapatellar fat pad may be subject to trauma, impingement, inflammation or tumoral formations. Although tumors arising within or adjacent to IFP are not extremely rare, the literature can only provide limited information about them. This article aims to briefly review the current literature on tumors and tumor-like lesions of the IFP and surrounding tissues; focusing on diagnosis and treatment management.

A rare localized giant cell tumor of the tendon sheath originating from the ligamentum mucosum: A case report

“…In addition, hemosiderin (brown color) may be present but typically less than is seen in PVNS, and multinucleated giant cells are common. [2,3,13] Differential diagnosis includes ganglion cyst, PVNS, or fibromas. [1,13] Pigmented villonodular synovitis is histologically identical with GCTTS but it most commonly involves the whole synovium in larger joints and pronounced hemosiderin, which produces a characteristic signal on MRI.…”

“…[2,3,13] Differential diagnosis includes ganglion cyst, PVNS, or fibromas. [1,13] Pigmented villonodular synovitis is histologically identical with GCTTS but it most commonly involves the whole synovium in larger joints and pronounced hemosiderin, which produces a characteristic signal on MRI. [14] Giant cell tumor of the tendon sheath and ganglion cysts can be distinguished by ultrasound; GCTTS is solid, nodular, and has internal vascularity while a ganglion cyst has a cystic component with well-defined borders and no internal vascularity.…”

Localized pigmented villonodular synovitis with hemorrhage arising from lateral meniscocapsular junction: A case report

“…[12] Symptoms typically progress for a long time before patients seek medical attention. [4][5][6] However, an unusual symptom of acute severe pain or locking may occur. [6] Mechanical symptoms of LPVNS depend on its size and location.…”

“…progresses for a long time before patients seek medical attention. [4][5][6] There may be an acute severe pain, however. [7] In this article, we report a case of LPVNS arising from the junction of the mid-body of lateral meniscus and the lateral joint capsule in the knee with an acute painful locked knee joint.…”

Rare case of intra‐articular lymphoma of the knee arising from the Hoffa fat pad

“…Lymphoma around the knee is rare and has previously been described arising from the synovial membrane. [2][3][4][5] There are case reports of lymphoma arising from the patella. There are also previous case reports of intra-articular lymphoma being found at the time of joint replacement; 6 however, these failed to specify the origin of the lesion.…”