Primary Cutaneous Sarcomatoid Anaplastic Lymphoma Kinase-Positive Anaplastic Large-Cell Lymphoma With Linear...

Area of Science:

• Dermatology
• Oncology
• Pathology

Background:

• Anaplastic large-cell lymphoma (ALCL) is a type of non-Hodgkin lymphoma.
• Cutaneous ALCL involves the skin and can present with diverse morphologies.
• The sarcomatoid variant is an exceptionally rare morphological subtype of ALCL.

Observation:

• A case of cutaneous ALCL with linear lesions and sarcomatoid histologic features is presented.
• The patient's tumor cells exhibited a transition in morphology from the sarcomatoid variant at initial diagnosis to the classic variant at relapse.
• This morphological shift presents significant diagnostic challenges in both clinical and histological assessments.

Findings:

• The study highlights a rare instance of cutaneous anaplastic lymphoma kinase-positive anaplastic large-cell lymphoma (ALCL) exhibiting a sarcomatoid variant.
• A key finding is the documented transformation of the tumor's morphology from a sarcomatoid to a classic ALCL variant between initial diagnosis and relapse.
• Linear distributional lesions were a notable clinical feature.

Implications:

• Increased awareness of the sarcomatoid variant of ALCL and its potential for morphological changes is crucial for accurate diagnosis.
• Recognizing these variations can improve patient management and treatment strategies for cutaneous ALCL.
• This case underscores the importance of considering rare presentations and dynamic morphological changes in lymphoma diagnosis.