Tsifountoudis Ioannis, Kapoutsis Dimitrios, Tzavellas Anastasios-Nektarios, Kalaitzoglou Ioannis, Tsikes Apostolos, Gkouvas George
Department of Radiology, 424 General Military Hospital, Ring Road N. Efkarpias, 56403 Thessaloniki, Greece.
Department of Orthopaedics, 424 General Military Hospital, Ring Road N. Efkarpias, 56403 Thessaloniki, Greece.
Case Rep Med. 2017;2017:3569512. doi: 10.1155/2017/3569512. Epub 2017 Jan 24.
Lipoma arborescens is a chronic, slow-growing, intra-articular lesion of benign nature, which is characterized by villous proliferation of the synovium, with replacement of the subsynovial connective tissue by mature fat cells. It usually involves the suprapatellar pouch of the knee joint. It is not a neoplasm but is rather considered a nonspecific reactive response to chronic synovial irritation, due to either mechanical or inflammatory insults. We report three cases of lipoma arborescens affecting the knee, the first in a young male without previous history of arthritis or trauma, the second in a 58-year-old male associated with osteoarthritis, and the final in a 44-year-old male diagnosed with psoriatic arthritis, which cover the entire pathologic spectrum of this unusual entity. We highlight the clinical findings and imaging features, by emphasizing especially the role of MRI, in the differential diagnosis of other, more complex intra-articular masses.
树枝状脂肪瘤是一种慢性、生长缓慢的良性关节内病变，其特征为滑膜呈绒毛状增生，滑膜下结缔组织被成熟脂肪细胞取代。它通常累及膝关节的髌上囊。它并非肿瘤，而是被认为是对慢性滑膜刺激的一种非特异性反应，这种刺激可能由机械性或炎症性损伤引起。我们报告了3例累及膝关节的树枝状脂肪瘤病例，第一例为一名无关节炎或创伤史的年轻男性，第二例为一名58岁患有骨关节炎的男性，最后一例为一名被诊断为银屑病关节炎的44岁男性，这些病例涵盖了这一罕见疾病的整个病理谱。我们重点介绍了临床发现和影像学特征，尤其强调了MRI在鉴别诊断其他更复杂的关节内肿物中的作用。
