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Eggshell calcification

Eggshell calcification refers to fine calcification seen at the periphery of a mass, and usually relates to lymph node calcification.

In 1967 Jacobsen and Felson published criteria to help "avoid over-reading of the incidental circumferential concentrations of calcium and to eliminate confusion with the ring shadows of bronchi on end." These criteria were:

  • shell-like calcifications up to 2 mm thick must be present in the peripheral zone of at least two lymph nodes
  • the calcifications may be solid or broken
  • in at least one of the lymph nodes the ringlike shadow must be complete
  • the central part of the lymph node may show additional calcifications
  • one of the affected lymph nodes must be at least 1 cm in its greatest diameter
Causes include

In the mediastinum and thorax

In the breast

Differential diagnosis

For eggshell like calcification appearances in the thorax consider

See also


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