Unlike meniscal tears and chondral defects, the mucoid degeneration of the anterior cruciate ligament (ACL) is a rare cause of knee pain and there have been no case reports of mucoid degeneration of both the ACL and the posterior cruciate ligament (PCL). A 48-year-old-male patient presented with knee pain and limitation of motion. The patient's magnetic resonance imaging, arthroscopic findings, and pathologic diagnosis confirmed a clinical diagnosis of mucoid degeneration of both the ACL and the PCL. The symptoms disappeared after arthroscopic partial excision of the ACL and PCL.
Anterior Cruciate Ligament/*pathology/radiography ; Arthralgia/etiology ; Humans ; Joint Diseases/diagnosis/*pathology/radiography ; Knee Joint/*pathology/radiography ; Male ; Middle Aged ; Posterior Cruciate Ligament/*pathology/radiography

Hypertrophic osteoarthropathy is characterized by clubbing of the digital tips and periosteal reaction of long bones. Most of the cases are associated with malignancy or other conditions such as congenital heart disease, liver cirrhosis, pulmonary fibrosis, biliary atresia, and gastrointestinal polyps. Hypertrophic osteoarthropathy associated with malignancy is rare in children. A few cases of hypertrophic osteoarthropathy in children with nasopharyngeal carcinoma have been reported, however, there has been no report of such case in Korea. We present a case of hypertrophic osteoarthropathy associated with nasopharyngeal carcinoma with lung metastasis in a 14-yr-old boy. In this case, hypertrophic osteoarthropathy regressed after intensive chemotherapy, but subsequently the patient died of progressive lung metastasis.
Adolescent ; Bone and Bones/radiography ; Carcinoma/*diagnosis/mortality ; Disease Progression ; Fatal Outcome ; Human ; Joint Diseases/pathology ; Lung Neoplasms/mortality/*secondary ; Male ; Nasopharyngeal Neoplasms/*diagnosis/mortality ; Neoplasm Metastasis ; Osteoarthropathy, Primary Hypertrophic/*diagnosis/mortality/radiography ; Prognosis