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Corresponding author. Hiroaki Nakagawa, Department of General Internal Medicine, Fukushima Medical University, 1, Hikarigaoka, Fukushima 960-1295 Japan.
An 87-year-old woman presented to the outpatient clinic with acute onset of swelling
and pain in her left lower leg. She had no recent episodes of trauma. Her vital signs
were normal. Physical examination showed a swollen left lower leg without signs of
inflammation and with ecchymosis around the medial malleolus (Figure 1A, arrows). Blood tests revealed normal C-reactive protein but elevated d-dimer (4.1 µg/mL). Ultrasonography and contrast-enhanced computed tomography showed
subcutaneous edema with fluid collection in the intermuscular spaces without any findings
of deep vein thrombosis (DVT) (Figure 1B, arrowheads). Given the history, physical findings, and imaging results, we made
a diagnosis of ruptured Baker's cyst. The symptoms had disappeared after 14 days of
rest and leg elevation.