F.ch.11yrs. A hard swelling at right upper arm laterally.

Mch 13yrs. A hard swelling left upper leg laterally.

Rx Dx please a 30yrs male complaint pain and swelling

A young boy with a small hard swelling at upper part of right leg medially.

This is a 14 yr old male ; swelling in the distal metaphyseal area in the right thigh

14 years old female with Right leg pain. Plain X Ray shows mass lesion in the upper part of tibia whats is the diagnosis