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| * [[Hypersensitivity pneumonitis]] | | * [[Hypersensitivity pneumonitis]] |
| Hypersensitivity pneumonia is always confusing a hypersensitivity pneumonitis especially if the triggering factor or the environmental exposure can be identified.
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| * [[Collagen vascular disease]] | | * [[Collagen vascular disease]] |
| Extensive serological evaluation is needed to rule out collagen diseases <ref name="Raghu-2011">{{Cite journal | last1 = Raghu | first1 = G. | last2 = Collard | first2 = HR. | last3 = Egan | first3 = JJ. | last4 = Martinez | first4 = FJ. | last5 = Behr | first5 = J. | last6 = Brown | first6 = KK. | last7 = Colby | first7 = TV. | last8 = Cordier | first8 = JF. | last9 = Flaherty | first9 = KR. | title = An official ATS/ERS/JRS/ALAT statement: idiopathic pulmonary fibrosis: evidence-based guidelines for diagnosis and management. | journal = Am J Respir Crit Care Med | volume = 183 | issue = 6 | pages = 788-824 | month = Mar | year = 2011 | doi = 10.1164/rccm.2009-040GL | PMID = 21471066 }}</ref>. The clinical, serologic, HRCT, and histolpathological findings may be helpful in distinguishing IIPs from ILD associated with collagen vascular disease CVDs. <ref name="Felício-">{{Cite journal | last1 = Felício | first1 = CH. | last2 = Parra | first2 = ER. | last3 = Capelozzi | first3 = VL. | title = Idiopathic and collagen vascular disease nonspecific interstitial pneumonia: clinical significance of remodeling process. | journal = Lung | volume = 185 | issue = 1 | pages = 39-46 | month = | year = | doi = 10.1007/s00408-006-0104-2 | PMID = 17294340 }}</ref> <ref name="Park-2007">{{Cite journal | last1 = Park | first1 = JH. | last2 = Kim | first2 = DS. | last3 = Park | first3 = IN. | last4 = Jang | first4 = SJ. | last5 = Kitaichi | first5 = M. | last6 = Nicholson | first6 = AG. | last7 = Colby | first7 = TV. | title = Prognosis of fibrotic interstitial pneumonia: idiopathic versus collagen vascular disease-related subtypes. | journal = Am J Respir Crit Care Med | volume = 175 | issue = 7 | pages = 705-11 | month = Apr | year = 2007 | doi = 10.1164/rccm.200607-912OC | PMID = 17218621 }}</ref> <ref name="Hwang-">{{Cite journal | last1 = Hwang | first1 = JH. | last2 = Misumi | first2 = S. | last3 = Sahin | first3 = H. | last4 = Brown | first4 = KK. | last5 = Newell | first5 = JD. | last6 = Lynch | first6 = DA. | title = Computed tomographic features of idiopathic fibrosing interstitial pneumonia: comparison with pulmonary fibrosis related to collagen vascular disease. | journal = J Comput Assist Tomogr | volume = 33 | issue = 3 | pages = 410-5 | month = | year = | doi = 10.1097/RCT.0b013e318181d551 | PMID = 19478636 }}</ref> <ref name="Song-2009">{{Cite journal | last1 = Song | first1 = JW. | last2 = Do | first2 = KH. | last3 = Kim | first3 = MY. | last4 = Jang | first4 = SJ. | last5 = Colby | first5 = TV. | last6 = Kim | first6 = DS. | title = Pathologic and radiologic differences between idiopathic and collagen vascular disease-related usual interstitial pneumonia. | journal = Chest | volume = 136 | issue = 1 | pages = 23-30 | month = Jul | year = 2009 | doi = 10.1378/chest.08-2572 | PMID = 19255290 }}</ref>. However a significant number of patients have overlapping serological findings, yet they do not meet the fully defined criteria for CVDs and still are categorized as IIPs.
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| * [[Human immunodeficiency virus]] | | * [[Human immunodeficiency virus]] |