Intralymphatic Histiocytosis: An Unusual Presentation

Area of Science:

• Dermatology
• Pathology
• Rare Diseases

Background:

• Intralymphatic histiocytosis (ILH) is a rare cutaneous condition characterized by livedoid patches or plaques.
• First described in 1994, ILH typically affects the extremities.

Observation:

• A 71-year-old female with psoriasis, significant smoking history, and recent Legionnaires disease presented with a facial lesion.
• The lesion was a red to violaceous, blanching, edematous, and mildly tender patch on the lower lip, chin, and anterior neck.

Findings:

• Histopathological examination confirmed ILH.
• The patient showed no response to topical tacrolimus, oral pentoxifylline, and topical steroids.
• Treatment was escalated to a TNF-ɑ inhibitor due to the apparent granulomatous nature of the condition.

Implications:

• This case underscores the diagnostic and therapeutic challenges associated with ILH.
• Limited literature exists on definitive cures, emphasizing the need for exploring various treatment modalities.
• Successful ILH management may depend on addressing underlying inflammatory conditions or malignancies.