Kaposiform lymphangiomatosis: a distinct aggressive lymphatic anomaly

Area of Science:

• Vascular Anomalies
• Pediatric Pathology
• Lymphatic Diseases

Background:

• A novel lymphatic disorder with unique histology and poor prognosis requires characterization.
• Understanding its clinical and imaging features is crucial for diagnosis and management.

Purpose of the Study:

• To describe the clinical and imaging characteristics of a newly identified lymphatic disorder.
• To propose a diagnostic term and understand the prognosis of this condition.

Main Methods:

• Observational, retrospective study of 20 patients with distinct lymphatic histopathology.
• Data collected from patients referred to the Vascular Anomalies Center at Boston Children's Hospital (1995-2011).

Main Results:

• Median age at onset was 6.5 years; presentations included respiratory and hemostatic abnormalities, and palpable masses.
• Generalized disease with common mediastinal involvement, effusions, and extrathoracic manifestations in bone and spleen.
• High mortality with 5-year survival at 51% and overall survival at 34% despite aggressive therapy.

Conclusions:

• Kaposiform lymphangiomatosis (KLA) is a distinct clinicopathologic lymphatic anomaly characterized by spindled lymphatic endothelial cells.
• KLA involves intrathoracic and extrathoracic sites, leading to significant morbidity and mortality.
• The high mortality rate underscores the aggressive nature of KLA, even with multimodal therapy.