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Relapsing polychondiritis: 3 clinical criteria + Bx confirmation should be met for a diagnosis: Skin findings are unremarkable (unlike CNH), however, underlying cartilage shows degeneration and mixed inflammatory infiltrate affecting the chondrocytes

Palmar fibromatosis:

Thyroglossal duct cyst: #Dermpath365 #Dermpath

Acral skin, well circumscribed, grenz zone of papilary dermal spairing: Superficial acral fibromyxoma: #Dermpath #Dermpath365

proliferation of irregular vascular channels partly surrounding preexisting vessels in some areas.classic appearance is of small vessels protruding into an abnormal vascular space="promontory sign": Kaposi sarcoma #Dermpath365 #Dermpath Patrick Rush Rosalynn Nazarian MD LMD

eosinophils in vascular wall w/damage: Churg-Strauss Syndrome/Allergic granulomatosis with angitis. Rare disorder with feat. of asthma,fever&multisystem vasculitis,extravascular granulomata &hypereosinophilia. #Dermpath365 #Dermpath Patrick Rush Rosalynn Nazarian MD LMD

Nipple eczema #Dermpath365 #dermpath

Perivascular distribution of tumor cells in an "onion skinning' fashion: myopericytoma #Dermpath365 #Dermpath

Broad band/plaque-like proliferation of capillary vessel in the superficial dermis arranged parallel to the surface, often in a setting of solar elastosis: Acquired elastotic hemangioma #Dermpath365 #Dermpath Patrick Rush Jerad Gardner, MD Rosalynn Nazarian MD LMD

red cell extravasation, lack of inflammatory infiltrate and extensive solar damage: non-inflammatory purpura (Senile purpura/ actinic purpura), connective tissue fails to support the vasculature #Dermpath365 #Dermpath Patrick Rush Jerad Gardner, MD Rosalynn Nazarian MD LMD

LSA - dermal hyalinization with underlying lichenoid lymphocytic infiltrate #dermpath

melanoma excision w/ residual pigmentation - only melanophages present, melanoma markers neg #dermpath

storiform collagenom=sclerotic fibroma, whorled hyalinized collagen w/ clefts, multiple seen in Cowden's #dermpath

acute folliculitis with rupture in a giant congential nevus, clinically concerning for melanoma #dermpath

Munro microabscess = neutrophils in stratum corneum in psoriasis, vs. pustule of Kogoj in stratum spinosum #dermpath

MRSA deep dermal colony of gram+ cocci in abscess

Relapsing & recurring papules&erosions linearly along Blaschko's lines: Relapsing linear acantholytic dermatosis #Dermpath #Pathology #Derm

Corps ronds and grains of Darier. Greasy papules & plaques: Darier's disease, autosomal dominant (yet 47% have no family Hx) #Dermpath #Path

Widespread papules&arthritis. Histiocytes, giant cells w/"GroundGlass" 2tone cytoplasm. PAS-D+: Multicentric Reticulohistiocytosis #Dermpath

Cellular Neurothekeoma: dermal neoplasm unclear histogenesis, histologically varied: nested, sheet like or myxoid.NKIC3 usually+ #Dermpath