Pulmonary apical cap

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Pulmonary apical cap, abbreviated PAC, is a rare benign lung pathology that is found at one or both of the apices.[1]

General

  • Possibly due to ischemia.[2]

Gross

  • Spiculated mass at the apex - 0.7 to 5.2 cm.[2]

Microscopic

Features:[2]

  • Fibroelastotic scar with mature collagen and wavy/curled (accordion-like) elastic fibres.
  • Alveolar enlargement at lesion periphery ("scar emphysema").

DDx:

See also

References

  1. ↑ Lagstein, A. (Oct 2015). "Pulmonary Apical Cap-What's Old Is New Again.". Arch Pathol Lab Med 139 (10): 1258-62. doi:10.5858/arpa.2015-0224-RA. PMID 26414471.
  2. ↑ 2.0 2.1 2.2 Yousem, SA. (May 2001). "Pulmonary apical cap: a distinctive but poorly recognized lesion in pulmonary surgical pathology.". Am J Surg Pathol 25 (5): 679-83. PMID 11342783.
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