An Unusual Case of Giant Cell Tumor of First Metatarsal
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Giant cell tumor (GCT) or osteoclastoma is an osteolytic, mostly benign but locally aggressive tumor occurring in young adults at the epiphysis. Area of predilection is mainly long bones (85-90%). 4% of GCT are also found in iliac bone, spine and only 2% in hand (of which GCT phalanges are more common than metacarpal). GCT of metatarsal is a very rare occurrence with very few cases being reported so far.

Case Report
A 40-year-old male presented with complain of swelling over the dorsum of left foot for the duration of 2 years and pain in that foot for 4 months. Swelling was insidious in onset and has progressively increased in size. Pain was mild to moderate in intensity, dull aching and continuous. On examination, there was a localized ovoid shaped swelling 7 by 4 cm over the dorsum of the left foot opposing 1st and 2nd metatarsal area with well-defined margins, tender on deep palpation, hard in consistency and the overlying skin was free. Radiographs revealed an expansile osteolytic lesion of entire 1st metatarsal involving the articular surface of tarsometatarsal joint and metatarsophalangeal joint with impingement on 1st metatarsal and cortical thinning.

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