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==Lichen planus== | ==Lichen planus== | ||
*Oral pathology. | *Oral pathology. | ||
===Microscopy=== | |||
Features: | |||
*Loss of rete ridges. | |||
*Loss of basal cells (stratum basale). | |||
*Interface dermatitis (lymphocytes at dermal-epidermal junction). | |||
Ref.: [http://emedicine.medscape.com/article/1078327-overview http://emedicine.medscape.com/article/1078327-overview]. | Ref.: [http://emedicine.medscape.com/article/1078327-overview http://emedicine.medscape.com/article/1078327-overview]. | ||
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DDx: | DDx: | ||
*Epidermal inclusion cyst. | *Epidermal inclusion cyst. | ||
==Syringoma== | |||
*Benign sweat duct tumour. (???) | |||
*Eccrine differentiation. | |||
===Microscopic=== | |||
Features:<ref>URL: [http://emedicine.medscape.com/article/1059871-diagnosis http://emedicine.medscape.com/article/1059871-diagnosis]. Accessed on: 12 May 2010.</ref> | |||
*Proliferation of benign ducts with lined by a bilayer (as in normal sweat ducts) with abnormal architecture: | |||
**Tadpole like appearing ducts. | |||
Image: | |||
*[http://www.flickr.com/photos/euthman/2329061316/ Syringoma (flickr.com)]. | |||
==Bullous disease== | ==Bullous disease== |
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