Answer for BIR CoW 26 Nov 2023
Hemangiopericytoma of left zygomatic bone
Findings
findings - axial and coronal sections CT SCAN shows isodense intraosseus lesion in the left zygomatic bone with soft tissue component expanding the bone involving the lateral aspect of left orbit. findings are consistent with Hemangiopericytoma.
Discussion
Hemangiopericytoma - Primary hemangiopericytoma of bone is a rare malignant tumor. it is an uncommon malignant vascular tumor derived from the pericytes of Zimmerman which surround the capillaries.HPC is a rare vascular soft-tissue tumor that can develop anywhere in the body that has blood vessels, most notably in lower extremities, pelvic fossa, retroperitoneum and nasopharynx. The peak incidence is in the fourth and fifth decades . HPC rarely involves the orbit and constitutes only 1.57% of orbital tumors . Likewise, bones are uncommonly involved in HPC,which accounts for 4.7% of bone tumors Imaging Most HPCs occur in lower extremities, pelvis 15% occur in head and neck Intracranial/meningeal: Parasellar & paraclival Orbit, cervical soft tissues, sinonasal cavity CT findings Well circumscribed, lobular, avidly enhancing; more invasive behavior if high grade (CECT) May see bone erosion or remodeling (bone CT) MR findings Intermediate T1, high T2 signal Vascular flow voids common Prominent enhancement, typically uniform
Findings
findings - axial and coronal sections CT SCAN shows isodense intraosseus lesion in the left zygomatic bone with soft tissue component expanding the bone involving the lateral aspect of left orbit. findings are consistent with Hemangiopericytoma.
Discussion
Hemangiopericytoma - Primary hemangiopericytoma of bone is a rare malignant tumor. it is an uncommon malignant vascular tumor derived from the pericytes of Zimmerman which surround the capillaries.HPC is a rare vascular soft-tissue tumor that can develop anywhere in the body that has blood vessels, most notably in lower extremities, pelvic fossa, retroperitoneum and nasopharynx. The peak incidence is in the fourth and fifth decades . HPC rarely involves the orbit and constitutes only 1.57% of orbital tumors . Likewise, bones are uncommonly involved in HPC,which accounts for 4.7% of bone tumors Imaging Most HPCs occur in lower extremities, pelvis 15% occur in head and neck Intracranial/meningeal: Parasellar & paraclival Orbit, cervical soft tissues, sinonasal cavity CT findings Well circumscribed, lobular, avidly enhancing; more invasive behavior if high grade (CECT) May see bone erosion or remodeling (bone CT) MR findings Intermediate T1, high T2 signal Vascular flow voids common Prominent enhancement, typically uniform
Note:
We do not discourage differential diagnosis. But all the differentials must satisfy the findings noted in the case.
If you feel you have answered rightly but cannot find your name in the above list, please call 09551942599.
Did you Know?
The order in which the names appear in this winner's list is based on the time of submission. The first person to send the correct answer gets his/her name on top of the list!
We do not discourage differential diagnosis. But all the differentials must satisfy the findings noted in the case.
If you feel you have answered rightly but cannot find your name in the above list, please call 09551942599.
Did you Know?
The order in which the names appear in this winner's list is based on the time of submission. The first person to send the correct answer gets his/her name on top of the list!