PMC4028921_01
PMC4028921_02
PMC4028921_03
(A) Axial and (B) coronal CT reveals a high-attenuating mass (1200-1400 HU) extending from the right pterygoid plate to the condyloid process of mandible replacing lateral pterygoid muscle. Bone window (C) shows a high-density lesion extending from the right pterygoid plate to the ramus of mandible involving medial pterygoid muscle (arrowhead). (D and E) show a linear band of ossification involving the left temporalis muscle inserting into the coronoid process (arrowhead). 3D VRT (F) shows a bony bar connecting the right lateral pterygoid plate to the ramus of the mandible (asterisk)
IJRI-24-75-g001.jpg
PMC4028921_03_IJRI-24-75-g001.jpg
F1
Another similar mass was seen extending from the lateral pterygoid plate to condylar neck, involving the lateral pterygoid muscle [Figure 1A-D]. A linear high-attenuation band was seen in the inferior portion of left temporalis muscle connecting with the coronoid process [Figure 1D and E]. Volume-rendered technique (VRT) showed a bony bar connecting the right lateral pterygoidplate to the ramus of the mandible [Figure 1F].
MRI - axial T1W (A) T2W (B) coronal T1W (C) and MERGE (D) images show a darkly hypointense mass extending from the lateral pterygoid plate to the ramus of mandible on the right side (asterisk). Coronal T1W (E) and MERGE (F) images show a hypointense band extending from the lateral pterygoid plate to the condylar neck on the right side (arrow)
IJRI-24-75-g002.jpg
PMC4028921_03_IJRI-24-75-g002.jpg
F2
Magnetic resonance imaging (MRI) of head and neck on a 1.5 T magnet [with axial T1-weighted (T1W), T2-weighted (T2W), coronal T1W, and multiple-echo recombined gradient echo (MERGE) sequences] revealed ahypointense mass extending from the right lateral pterygoid plate to the ramus of mandible; coronal T1W and MERGE images showed a hypointense mass extending from the right lateral pterygoidplate to the condylar neck, involving the lateral pterygoid muscle [Figure 2A-D].
Histopathology slide shows distinct zonal pattern of innermost immature loosely textured richly vascularized fibroblastic zone with mild degree of pleomorphism intermingled with sparse inflammatory cells, fibrinous material, and few multinucleated giant cells. An intermediate zone of ill-defined trabaculae and a peripheral zone of osteoid showing calcification and, at places, mature lamellar bone is seen (A-C). Areas of focal hemorrhage, fibrin, and entrapped muscle fibers are also seen (D)
IJRI-24-75-g003.jpg
PMC4028921_03_IJRI-24-75-g003.jpg
F3
An intermediate zone of ill-defined trabeculae and a peripheral zone of osteoid showing calcification and, at places, mature lamellar bone was seen Figure 3A-C. Areas of focal hemorrhage, fibrin, and entrapped muscle fibers were also seen Figure 3D.
PMC4028921_04