Author/Authors :
Ensafdaran، Ahmad نويسنده Research Center of Bone and Joint Diseases, Department of Orthopedics, Chamran Hospital, Shiraz University of Medical Sciences, Shiraz, Iran , , Vosoughi، Amir Reza نويسنده Research Center of Bone and Joint Diseases, Department of Orthopedics, Chamran Hospital, Shiraz University of Medical Sciences, Shiraz, Iran , , Khozai، Arash نويسنده Research Center of Bone and Joint Diseases, Department of Orthopedics, Chamran Hospital, Shiraz University of Medical Sciences, Shiraz, Iran , , Torabi، Simin نويسنده Department of Pathology and Shiraz Nephrology Urology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran , , Ensafdaran، Mohammad Reza نويسنده Research Center of Bone and Joint Diseases, Department of Orthopedics, Chamran Hospital, Shiraz University of Medical Sciences, Shiraz, Iran ,
Abstract :
This report describes a rare intra-articular benign tumor, lipoma arborescens, of
the knee joint in a 21 year-old female. The patient suffered from left knee joint swelling
for five years with occasional pain. Swelling was soft and boggy in the suprapatellar
area. Motion of joint was complete. No abnormality was detected in any laboratory
tests. MRI showed a large soft tissue density in the suprapatellar area with high signal
intensity on T1 and T2 weighted images. Operative arthroscopy revealed a creamy
brown hypertrophied synovium with diffuse papillary processes characterized by
villous proliferation of the synovium infiltrated by mature fat tissue, chronic
inflammatory cells and vessels as seen in the pathologic slides. Lipoma arborescens
or villous lipomatous proliferation of the synovial membrane should be distinguished
from other similar lipomatoid conditions such as synovial lipoma and Hoffa disease.
Lipoma arborescens should be considered in patients with painless, slowly progressive
swelling of a joint, especially the knee.
