MICA

CT

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← Morphological semiology & imaging

9 sheets

CT

Honeycombing · CT

Clustered subpleural cystic airspaces associated with distorted lung architecture.

Morphology: Clustered visible-walled cysts
Site: Often subpleural
Association: Distortion and fibrosis
Aetiology: Determined in context

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Splenic nodules attributed to sarcoidosis. Authentic document with original caption context retained.

CT

Splenic nodules: CT

Splenic nodules attributed to sarcoidosis.

Observation: Focal splenic density abnormalities are visible.
Limitation: Nodules are not specific for sarcoidosis.

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CT attributed to exudative pancreatitis. Authentic document with original caption context retained.

CT

Pancreatitis: peripancreatic abnormalities

CT attributed to exudative pancreatitis.

Observation: Peripancreatic changes are visible.
Limitation: One slice cannot establish a complete score.

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Bone-window CT showing hyperdense deposits around the odontoid process on axial and sagittal views, without a visible identifier.

CT

Periodontoid calcifications: CT

Calcific deposits around the odontoid process; crowned dens syndrome also requires a compatible clinical setting.

Location: C1–C2 junction
Appearance: Calcific deposits
Modality: Bone-window CT
Syndrome: Clinical and imaging findings

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Bronchial dilatation identified by the author. Authentic document with original caption context retained.

CT

Bronchiectasis: coronal CT

Bronchial dilatation identified by the author.

Observation: Dilated bronchial structures appear at the lung base.
Limitation: One slice cannot establish the full extent.

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Contrast-enhanced axial image: the original black arrow points to a membrane within the ascending aortic lumen. This slice does not show the full extent.

CT

Aortic dissection: intimal flap

Identify the flap and recognise the implications of ascending aortic involvement.

Sign: Intimal flap
Site: Ascending aorta
Classification: Type A when ascending involvement is confirmed
Priority: Urgent aortic specialist assessment

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Two CT pulmonary angiographic views from the published case: low-attenuation material at the bifurcation and within opacified pulmonary branches. Source resolution is limited.

CT

Pulmonary embolism: filling defect

Identify an intraluminal defect and distinguish clot burden from clinical severity.

Sign: Filling defect
Examination: CT pulmonary angiography
Severity: Haemodynamics and right ventricle
Pitfall: Central location alone does not grade severity

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CT

Crazy paving · CT

Ground-glass opacity with superimposed septal or intralobular lines, producing a paving-stone appearance.

Background: Ground-glass opacity
Lines: Septal and/or intralobular
Pattern: Paving-stone appearance
Value: Not pathognomonic

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CT

Ground-glass opacity · CT

Increased lung attenuation with preserved visibility of vessels and bronchial walls.

Attenuation: Increased, partial
Vessels: Remain visible
Distribution: Focal or diffuse
Specificity: Non-specific finding

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