Pathology · patient case question
Which extra-oral site most requires urgent evaluation in this condition?
Patient case: Desquamative gingivitis with generalized erythema and focal ulceration
Patient: Female, 61 years old
Chief Complaint: “My gums are raw and they peel when I brush.”
Background: No relevant medical history recorded at presentation. No new medications. Reports intermittent grittiness and redness of both eyes over the past year, attributed to dryness.
Vital Signs: BP 130/80 mmHg · HR 74 bpm · T 98.2°F
Findings: Generalized erythema of the attached and marginal gingiva with focal areas of ulceration and sloughing. Gentle lateral pressure produces separation of the epithelium. Direct immunofluorescence shows a linear band of IgG and C3 along the basement membrane zone.
Show answer and explanation
Correct answer: A. The eye
- A. CORRECT. Mucous membrane (cicatricial) pemphigoid is SCARRING by nature, and OCULAR involvement is the complication that causes irreversible harm. Conjunctival inflammation leads to SYMBLEPHARON — adhesions between the palpebral and bulbar conjunctiva — then entropion, trichiasis, corneal scarring and, if untreated, BLINDNESS. The mouth is the commonest site of onset and the eye the second, so any patient with this diagnosis needs prompt OPHTHALMOLOGY referral even when ocular symptoms seem trivial, as here.
- B. Thyroid autoimmunity co-occurs with several autoimmune conditions but is not the site-specific risk that defines management in this disease.
- C. Renal involvement characterises lupus and the ANCA-associated vasculitides, not mucous membrane pemphigoid.
- D. Hepatic involvement is not a recognised feature.
Note: Other mucosal sites that scar and matter: the NASOPHARYNX and LARYNX, where stenosis threatens the airway, and the OESOPHAGUS, where stricture causes dysphagia. The immunofluorescence pattern is the diagnostic pivot — a LINEAR band of IgG and C3 at the basement membrane means pemphigoid and a SUBepithelial split; an INTERCELLULAR fishnet pattern means pemphigus vulgaris and an INTRAepithelial, suprabasilar split.