Spongiosis
Pronunciation: spon-jee-OH-sis
Intercellular oedema within the epidermis, a key histological feature of eczematous (spongiotic) dermatitis.
Full Definition
Spongiosis is the accumulation of fluid between keratinocytes in the epidermis, stretching and eventually breaking desmosomes to produce microvesicles or frank vesicles visible both histologically and clinically. It is the defining microscopic feature of the spongiotic reaction pattern, which encompasses conditions such as acute and subacute eczema/dermatitis, pompholyx, and some drug eruptions. Editors working on dermatopathology manuscripts must differentiate spongiosis from acantholysis (desmosomes are broken by inflammatory oedema in spongiosis vs. autoimmune attack in acantholysis) and from 'exocytosis' (inflammatory cell migration into the epidermis). The adjective form is 'spongiotic,' as in 'spongiotic dermatitis.'
Usage
Usage note: The adjective is 'spongiotic' (not 'spongiosis-related'). Distinguish from acantholysis (immune-mediated cell separation) and exocytosis (cell migration into epidermis).
In Context
- "Histology revealed moderate spongiosis with a superficial perivascular lymphocytic infiltrate, consistent with subacute spongiotic dermatitis." — Dermatopathology biopsy report
- "The author incorrectly described the vesicle formation as 'acantholytic'; this should be revised to 'spongiotic' given the clinical context of eczema." — Peer-review editorial comment