Congenital flat foot or Left side Charcot Foot or congenital hypertrophy of the left foot Myxofibroma of foot or an example of Mosaicism affecting the foot
i took a closer look at that image and I guess u r right...the abductor digiti minimi is really huge. So like u said..this could be a case of isolated hypertrophy of the abductor digiti minimi muscle. But I think there is slight hypertrophy of other muscles as well. So please take MRI of both feet for a comparison of the other muscles ( although it is only of academic interest ).
click to enlarge as you can see in this disordered image, the swallen area is interesting only the 5th column side. the diastais between 4th and 5th metatarsal can be easily palpated and it is made of soft tissues. the gray lines drawn from 1 to 4 rays are copy-pasted using mspaint, they have the same measure: this means the lenght is identical for booth feet till the 5th ray: I think this hypertrophy (?) only matters the abdutor digiti minimi and maybee some interosseus muscle. This boy is 15 and this condition is congenital. i would exlude charcot. Flat foot is probably present but not inherent with the subject of our studying edit: today i asked the boy for a picture of the dorsal aspect of the foot on load (lateral glide of the swallen area could mean soft tissue hypertrophy), as soon as i could view previous doctors enquires i will ask for a MRI.
