Case Number : Case 2319 - 7 May 2019 Posted By: Uma Sundram

The histological findings are those of Pityriasis rosea. CPC is needed.

I agree PR is a good thought, but I also want to add lichen striatus.

Histological d/d could be PLC, PR, Lichen striatus. Need CPC for definitive diagnosis. 

PPD, LICHEN STRIATUS

spongiosis with lymphocyte exocytosis. there are extravasated RBCs in the dermis close to epidermis. there is lymphocytic infiltrate around the acrosynringeal duct

I favor Pityriasiform spongiotic dermatitis-however I am not able to see Mond like PK, second PR is annular but plaque like presentation-

Dermatophytosis- May be a PAS stain -rare

I thought of a PR of Gilbert too, because of many dermal and intra-epidermal RBCs and spongiosis with lymphocytic exocytosis. There aren't any mound parakeratosis, so also this case is difficult!  But PR is my first spot. 

lichen striatus is my first spot because of the patient's age.

Yes! LS could be a better spot! I didn't place much value on perivascular and peri-eccrine inflammatory infiltrate...

Agree with LS

Madam what is the final diagnosis

Hi everyone! Sorry for the delay in post. Busy planning for London Dermpath Symposium next week. Hope all of you can make it.

Patient had classic linear lesions of lichen striatus. PR (pityriasis rosea) is also an excellent thought.