Learning objectives
The purpose of this exhibit are:
1.
To be familiar with paranasal sinus anatomy and critical points on CT
and MR imaging interpretation.
2.
To view various significant pathological condition of paranasal sinus
diseases.
Background
The word “sinus” comes from a Latin word meaning fold or pocket.
There are a total of four paired sinuses: frontal,
ethmoid,
maxillary and sphenoid.
Considering the mystery that describes human anatomy,
what purposes do paranasal sinuses serve? Unfortunately,
we still are unsure as to all the functions of these sinuses (Fig.
1,
2).
Imaging findings OR Procedure details
Normal anatomy of paranasal sinus
CT
Until recently,
CT of the paranasal sinus had been achieved by the direct coronal image on conventional techniques.
With the advent of MDCT,
axial CT of bone and soft-tissue window with thin slice coronal reconstructionsis now the norm.
CT scans typically obtained for visualizing the paranasal sinus should include coronal and axial (3-mm or less) cross sections.
Noncontrast CT of the paranasal sinuses is performed for most patients with sinusitis.
Contrast-enhanced CT is particularly useful in evaluating neoplastic,
chronic,...
Conclusion
The important role of CT is to evaluate:
The presence of soft tissue mass
Sinusitis: affected sinus as well as osteomeatal unit (OMU)
Bone abnormality
Preoperative evaluation of FESS
Calcified lesion
The important role of MRI is to evaluate:
Soft tissue in detail
Tumor spread in soft tissue
Distinction of the tumor from secretion
Vascularity
Perineural tumor spread (PTS)
Intracranial invasion
A detailed knowledge of the anatomy of paranasal sinus and adjoining structures,
and a systematic analysis of their integrity should allow precise identification of...
References
Janfaza P,
et al: Nasal cavities and paranasal sinuses.
In: Surgical anatomy of the head and neck,
Lippincott-Williams and Wilkins,
Philadelphia,
2001,
p259-318.
Veillon BJ,
et al: Magnetic resonance imaging of massive intracranial invasion by an ethmoidal adenoid cystic carcinoma (cylindroma).
South Med J,
89: 321-323,
1996.
Oikawa K,
et al: Preoperative staging of sinonasal inverted papilloma by magnetic resonance imaging.
Laryngoscope,
113: 1983-1987,
2003.
Meyers RM,
et al: Interpretation of anatomic variations of computed tomography scans of the sinuses: a surgeon’s perspective.
Laryngoscope,
108:...
Personal Information
Thank you for viewing our exhibit.
If you have any questions or comments,
please let me know by email:
[email protected]