Infectious / inflammatory disorders
Infectious mononucleosis

Topic Completed: 1 October 2012

Minor changes: 18 March 2019

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PubMed Search: Infectious mononucleosis[TI] spleen[TI]

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Cite this page: Mansouri J. Infectious mononucleosis. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/spleeninfectiousmono.html. Accessed May 29th, 2020.
Definition / general
  • May cause spontaneous splenic rupture and death, often 10 - 21 days after disease onset
  • Rupture may be due to increased intrasplenic pressure due to congestion and weakening of splenic capsule from infiltration by immunoblasts
Case reports
Clinical images

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Grossly enlarged with haematoma

Microscopic (histologic) description
  • Expansion of red pulp with immunoblastic proliferation
  • Immunoblasts may have strikingly atypical morphology, resemble Reed-Sternberg cells, infiltrate subintima of intratrabecular veins, occasionally exhibit hemophagocytosis
Positive stains
  • Immunoblasts are positive for B and T cell markers, EBV by in situ hybridization, variable CD30
Differential diagnosis
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