Evaluation of Joint Formation in Coronoid Process Hyperplasia (Jacob's Disease) on CT and MR Imaging.

Background: Jacob's disease is a rare pathology characterized by elongation/ enlargement of coronoid process of mandible with formation of pseudoarticulation with zygomatic arch. It presents clinically as restricted mouth opening and is often misdiagnosed as temporomandibular joint pathology.

Case Presentation: We performed cross sectional imaging and evaluation of Jacob's disease in a 14-year-old girl with restricted mouth opening, CT images including Multiplanar Reconstruction and Volume Rendered Technique revealed enlarged left coronoid process of mandible while open mouth CT images and MR images concluded the presence of joint between enlarged coronoid process and zygomatic arch.

Unusual Presentation of Paraosteal Lipoma in Skull.

Unlabelled: Paraosteal lipomas are rare benign neoplasm composed of mature adipose tissue with underlying bone changes. They are extremely rare to occur in head and neck region. We present a case of a 40-year-old male with a paraosteal lipoma of occipital region.