Caldwell's view explained

Caldwell's view (or Occipitofrontal view) is a radiographic view of the skull where the X-ray plate is perpendicular to the orbitomeatal line. The rays pass from behind the head and are angled at 15-20° to the radiographic plate. It is commonly used to get better view of the ethmoid and frontal sinuses.^[1] It is named after the noted American radiologist Eugene W. Caldwell, who described it in 1907.^{[2] [3]}

Structures seen

• Frontal sinus
• Ethmoidal sinus
• Orbit
• Orbital rim
• Medial orbital wall
• Zygomatic bone
• Nasal bone
• Nasal septum
• Mandible

Possible observations

Pathology	Observation
Normal	Different pneumatisation patterns of frontal sinus are observed in population. The frontal sinuses can be asymmetric in normal individual. Usually, frontal sinus shows radiolucent shadow and individual cells are made out, giving it a scalloping or clove-like appearance.
	Increased frontal sinus opacity. Normal scalloping absent.
	Marked radiopacity is seen. (Denser than bone)
Erythroblastic anemia	Hypopneumatisation (decreased pneumatisation) is common finding in sickle cell anemia and beta thalassemia. Hyperpneumatisation (increased pneumatisation) is common finding in Acromegaly and Sturge–Weber syndrome.

Notes and References

1. Yanagisawa. E.. Smith. H. M.. 1968-03-01. Radiographic Anatomy of the Paranasal Sinuses: IV. Caldwell View. Archives of Otolaryngology–Head & Neck Surgery. en. 87. 3. 311–322. 10.1001/archotol.1968.00760060313016. 5642379. 0886-4470.
2. Berk. R N. June 1995. Eugene W. Caldwell Lecture. Why Caldwell?. American Journal of Roentgenology. en. 164. 6. 1321–1322. 10.2214/ajr.164.6.7754868. 0361-803X. 7754868.
3. Hoeffner. E.G.. Mukherji. S.K.. Srinivasan. A.. Quint. D.J.. December 2012. Neuroradiology Back to the Future: Head and Neck Imaging. AJNR. American Journal of Neuroradiology. 33. 11. 2026–2032. 10.3174/ajnr.A3365. 0195-6108. 7965588. 23064595.