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| A '''Simon focus''' is a ] (TB) nodule that can form in the ] of the ] when a primary TB infection elsewhere in the body spreads to the lung apex via the bloodstream.<ref name=Leung>{{cite journal|last=Leung|first=AN|title=Pulmonary tuberculosis: the essentials.|journal=Radiology|date=February 1999|volume=210|issue=2|pages=307–22|pmid=10207408|doi=10.1148/radiology.210.2.r99ja34307}}</ref> Simon focus nodules are often ].<ref name=Leung /> | A '''Simon focus''' is a ] (TB) nodule that can form in the ] of the ] when a primary TB infection elsewhere in the body spreads to the lung apex via the bloodstream.<ref name=Leung>{{cite journal|last=Leung|first=AN|title=Pulmonary tuberculosis: the essentials.|journal=Radiology|date=February 1999|volume=210|issue=2|pages=307–22|pmid=10207408|doi=10.1148/radiology.210.2.r99ja34307}}</ref> Simon focus nodules are often ].<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, 8th edition</ref> | |||
| • In adolescence, Simon foci may get reactivated to become Assmann foci. Such foci are sharply circumscribed, firm, gray-white to yellow areas that have a variable amount of central caseation & peripheral fibrosis. | |||
| == References == | == References == | ||
Revision as of 11:10, 9 July 2014
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. Simon focus nodules are often calcified.
• 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. • In adolescence, Simon foci may get reactivated to become Assmann foci. Such foci are sharply circumscribed, firm, gray-white to yellow areas that have a variable amount of central caseation & peripheral fibrosis.
References
- ^ Leung, AN (February 1999). "Pulmonary tuberculosis: the essentials". Radiology. 210 (2): 307–22. doi:10.1148/radiology.210.2.r99ja34307. PMID 10207408.
- Robbins, 8th edition
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