Cutis rhomboidalis nuchae
CRN primarily affects elderly men and women with lighter skin phototypes and history of significant sun exposure. Outdoor occupations also predispose patients to CRN.
CRN is a chronic condition, and once the skin changes have occurred, it is difficult, if not impossible, to reverse the appearance of the skin.
L57.2 – Cutis rhomboidalis nuchae
89019003 – Cutis rhomboidalis nuchae
Differential Diagnosis & Pitfalls
- Lichen simplex chronicus – Lines not as furrowed, and history of intense pruritus and rubbing is elicited.
- Systemic amyloidosis – More intense erythema, possible enlargement of the tongue, and biopsy demonstrates amyloid deposition.
- Favre-Racouchot syndrome – Acneiform lesions and agminated comedones.
- Psoriasis – Pink to red, erythematous, well-demarcated plaques with a silvery and micaceous scale; tends to involve the occipital scalp, which is relatively protected from the sun and not involved in CRN.
- Chronic actinic dermatitis
- Pseudoxanthoma elasticum