Question

A 21-year-old male presented with a 2-year history of right third toe swelling, which had recently become painful. He was otherwise well (Figs. 1, 2, 3, and 4).

Fig. 1
figure 1

DP and oblique radiographs of the right forefoot

Fig. 2
figure 2

a Sagittal T1W TSE and b coronal fat suppressed PDW FSE MR images of the right forefoot

Fig. 3
figure 3

Coronal CT study of the right forefoot at the time of needle biopsy

Fig. 4
figure 4

a and b Microphotographs (X20. H&E)