Boy  04 yo, difficulty
 swallowing for 3 months.  No
fever, no pain. Clinical  ENT  doctor’s  examination
 is suggestion of tonsil  tumor at
right side  (photo).
X-Rays of  the neck AP and lateral view: this mass  is
 calcified,   irregular border,   precervical spinal bone, size of  4 cm ( film 1, 2)
US examination of this mass: 
US 1: Longitudinal scan  the mass with
 strong shadowing cannot  inside this mass.
  
US 2: Cross-section view.
US 3: Relation of this mass with carotid and  cervical spinal bone.
CT scan= CT 1:sagittal view , CT 2:  cross- section  with PA view,  CT3: cross-section with AP view.
Based on clinical, X-Rays , ultrasound and CT, what is your diagnosis?
Based on  X-Rays and CT  some doctors  suggested  teratoma of oropharynx, or enchondroma.
MRI ( 2 pictures sagittal and  section) radiologist  diagnosis is  chondroma.
Operation today  removed one  
hard mass   looked like  stone.
Microscopic  report of this mass is fibrous dysplasia ossificans progressiva which is  same as  myositis ossificans
REFERENCE :  case  report.