Simon focus

A Simon focus is a tuberculosis (TB) nodule that can form in the apex of the lung when a primary TB infection elsewhere in the body spreads to the lung apex via the bloodstream.<ref name=Leung>Leung, AN,

 Pulmonary tuberculosis: the essentials., 
 Radiology, 
 
 Vol. 210(Issue: 2),
 pp. 307–22,
 DOI: 10.1148/radiology.210.2.r99ja34307,
 PMID: 10207408,</ref> Simon focus nodules are often calcified.<ref name=Leung />

The initial lesion is usually a small focus of consolidation, less than 2cm in diameter and located within 1 to 2 cm of the apical pleura.<ref>,

 Robbins Basic Pathology (8th edition), 
  
 Elsevier, 
 2007, 
  
  
 ISBN 978-1-4160-2973-1,</ref> In adolescence, Simon foci may become reactivated and develop into Assmann foci.<ref>

Assmann focus(link). {{{website}}}. Medicine.academic.ru.

</ref> Such foci are sharply circumscribed, firm, gray-white to yellow areas that have a variable amount of central caseation and peripheral fibrosis.

References

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