Parapharyngeal space sign 1 :Parapharyngeal fat pushed postero-mediall

Here, the mass is situated antro-lateral to push para pharyngeal fat postero-medial.
Causes:
-Muscle masses from pterygoid, masseter or temporalis muscles which could be N.H.lymphoma(children or adult) or rabdomyosarcoma(children).
-Mandibular masses such as adamantinoma, chondrosarcoma and osteosarcoma.

Mandibular osteosarcoma