title: Case records of the Massachusetts General Hospital. Weekly clinicopathological exercises. Case 17-1990. A 16-year-old boy with painful swelling of the left knee joint and calf.
mesh_terms: D000293:Adolescent; D001168:Arthritis / Q000150:complications / Q000175:diagnosis; D003937:Diagnosis, Differential; D006801:Humans; D007719:Knee Joint; D008297:Male; D011151:Popliteal Cyst / Q000150:complications; D013167:Spondylitis, Ankylosing / Q000175:diagnosis / Q000473:pathology*; D013924:Thrombophlebitis / Q000175:diagnosis