Pulmonary nodular lymphoid hyperplasia

Pulmonary nodular lymphoid hyperplasia (PNLH) is a type of benign lymphoproliferative disease that can affect the lung.

It can present in any age group although the majority of cases present between 50 and 70 years of age 6.

Most cases are usually asymptomatic and found incidentally on imaging for an unrelated cause. Occasionally, there can be symptoms such as shortness of breath, cough and/or pleuritic chest pain. 

Most, if not all, such cases are favoured tp represent extranodal marginal zone B-cell lymphomas masquerading as reactive lesions.

There is usually dense nodular infiltration of mature, polyclonal lymphocytes and plasma cells with multiple reactive germinal centres. These are sharply demarcated from surrounding parenchyma and with central areas of scarring. Foci of organising pneumonia may be commonly seen in the periphery. There can also be mild, local lymphangitic spread of lymphocytes permeating into the perivascular interstitium.

Associations
CT - HRCT chest

Usually present as a solitary lesion. Described features include 1

  • well-circumscribed nodular lesion: this can be a solitary pulmonary nodule or focal consolidation with an ~2 cm diameter
  • coalescence of two or more nodules can rarely occur to form a discrete mass
  • a very mild, focal lymphangitic pattern may be seen

It was initially described as pulmonary pseudolymphoma by S L Saltzstein in 1963 3. The term pulmonary nodular lymphoid hyperplasia was suggested by Kradin and Mark 6.

Imagin differential considerations include

  • pulmonary lymphoma (especially MALT lymphoma affecting lung)
    • nodules tend to be bilateral and multifocal and may show features such as pleural invasion
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Article Information

rID: 25549
System: Chest
Section: Pathology
Tag: cases
Synonyms or Alternate Spellings:
  • Nodular lymphoid hyperplasia - lung
  • Nodular lymphoid hyperplasia of lung
  • Nodular lymphoid hyperplasia of the lung

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