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CERVICOTHORACIC SIGN
IS ITALWAYS DEPENDABLE?
DR. C RAVINDRAN MD, DTCD, FRCP
PROFESSOR & SENIOR CONSULTANT
DEPT. OF PULMONARY MEDICINE
CERVICOTHORACIC SIGN
• When the cephalic border of a mass is obscured at or below the
level of the clavicles, it is deemed to be a “cervicothoracic lesion”
involving the anterior mediastinum (Positive cervicothoracic
sign).
• Mediastinal masses posterior to the trachea are well outlined
above the level of the clavicles (Negative cervicothoracic sign)
due to the interface with lung in the posterior aspects of the lung
apices.
• Superior mediastinal mass usually have a sharp well delineated
lateral border due to the aerated lung giving a good contrast.
• If it is in the anterior mediastinum the superior border ends at the
clavicle as the anterior mediastinum do not extend beyond
clavicle.
• At the same time posterior mediastinal mass extends above the
clavicle and the lateral border can be traced above the clavicle
FALLACY
• As per the above rule the lesion in figure A is an anterior
mediastinal mass as the cervicothoracic sign is positive.
• Look at the CT Thorax.
• It shows a superior mediastinal mass touching both anterior
and posterior chest wall
• Its base is towards the posterior aspect.
EXPLANATION
• This can be explained by the projection of X-Ray chest
PA view where anterior lesion is close to x-ray film and
will be more clear and sharp when compared to posterior
part which is distant from the film.
• So in this case even though the mass extends to posterior
mediastinum, anterior part is denser and clearly visible to
the eyes when compared to more distant posterior part.
• So the onlooker has a visual illusion that the lesion stops
at clavicle like an anterior mediastinal mass.
• This is a fallacy of cervicothoracic sign.
Cervicothoracic sign.pptx

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Cervicothoracic sign.pptx

  • 1. CERVICOTHORACIC SIGN IS ITALWAYS DEPENDABLE? DR. C RAVINDRAN MD, DTCD, FRCP PROFESSOR & SENIOR CONSULTANT DEPT. OF PULMONARY MEDICINE
  • 2.
  • 3.
  • 4. CERVICOTHORACIC SIGN • When the cephalic border of a mass is obscured at or below the level of the clavicles, it is deemed to be a “cervicothoracic lesion” involving the anterior mediastinum (Positive cervicothoracic sign). • Mediastinal masses posterior to the trachea are well outlined above the level of the clavicles (Negative cervicothoracic sign) due to the interface with lung in the posterior aspects of the lung apices. • Superior mediastinal mass usually have a sharp well delineated lateral border due to the aerated lung giving a good contrast. • If it is in the anterior mediastinum the superior border ends at the clavicle as the anterior mediastinum do not extend beyond clavicle. • At the same time posterior mediastinal mass extends above the clavicle and the lateral border can be traced above the clavicle
  • 5. FALLACY • As per the above rule the lesion in figure A is an anterior mediastinal mass as the cervicothoracic sign is positive. • Look at the CT Thorax. • It shows a superior mediastinal mass touching both anterior and posterior chest wall • Its base is towards the posterior aspect.
  • 6.
  • 7. EXPLANATION • This can be explained by the projection of X-Ray chest PA view where anterior lesion is close to x-ray film and will be more clear and sharp when compared to posterior part which is distant from the film. • So in this case even though the mass extends to posterior mediastinum, anterior part is denser and clearly visible to the eyes when compared to more distant posterior part. • So the onlooker has a visual illusion that the lesion stops at clavicle like an anterior mediastinal mass. • This is a fallacy of cervicothoracic sign.