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| ==Lymphocytic interstitial pneumonia== | | ==Lymphocytic interstitial pneumonia== |
| ===General===
| | {{Main|Lymphocytic interstitial pneumonia}} |
| *Often abbreviated '''''LIP'''''.
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| *Associated with autoimmune disorders ([[rheumatoid arthritis]], [[pernicious anemia]], Sjoegren syndrome)<ref>URL: [http://emedicine.medscape.com/article/299643-overview http://emedicine.medscape.com/article/299643-overview]. Accessed on: 2 June 2010.</ref> and immunodeficiency.<ref name=pmid16088689>{{cite journal |author=Nicholson AG |title=Lymphocytic interstitial pneumonia and other lymphoproliferative disorders in the lung |journal=Semin Respir Crit Care Med |volume=22 |issue=4 |pages=409–22 |year=2001 |month=August |pmid=16088689 |doi=10.1055/s-2001-17384 |url=}}</ref>
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| *Associated with viral infections ([[HIV]], EBV, human T-cell leukemia virus (HTLV) type 1).
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| ===Gross===
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| *Location: basilar predominance.
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| *Increased interstitial markings.
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| ===Microscopic===
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| Features:<ref>URL: [http://emedicine.medscape.com/article/299643-diagnosis http://emedicine.medscape.com/article/299643-diagnosis]. Accessed on: 2 June 2010.</ref>
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| *Small mature lymphocytes (usually B cells).<ref name=afip_vol2_265>AFIP atlas of nontumour pathology. 2002. Vo. 2. P.265. ISBN 1-881041-79-4.</ref>
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| *Plasma cells.
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| *+/-Lymphoid follicles.
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| Negatives:
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| *No Vasculitis.
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| *No necrosis.
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| Image: [http://www.scielo.br/img/revistas/jbpneu/v34n2/en_a02fig01.jpg LIP (scielo.br)].
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| DDx:
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| *[[Lymphoma]].
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| *Follicular bronchitis/bronchiolitis.
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| *Nodular lymphoid hyperplasia.
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| **This is determined in part by radiology; it has nodules radiographically.
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| ==Follicular bronchitis/bronchiolitis== | | ==Follicular bronchitis/bronchiolitis== |