Splenic Angiosarcoma with Bone Marrow Involvement Initially Diagnosed as Systemic Mastocytosis: A Case Report

Area of Science:

• Oncology
• Pathology
• Hematology

Background:

• Systemic mastocytosis and angiosarcoma are distinct hematologic and vascular malignancies, respectively.
• Spindled cells in bone marrow biopsies can present a diagnostic challenge.
• Distinguishing between these entities is critical for patient management and prognosis.

Observation:

• A patient initially suspected of having systemic mastocytosis due to spindled cells in bone marrow biopsies.
• A subsequent biopsy favored metastatic vascular malignancy with sarcomatoid features.
• The patient experienced rapid deterioration and passed away.

Findings:

• Post-mortem examination confirmed splenic angiosarcoma with metastasis to the liver and bone marrow.
• Splenic angiosarcoma is an aggressive malignancy, with bone marrow metastasis being exceptionally rare.
• The case illustrates overlapping morphological features between systemic mastocytosis and angiosarcoma in bone marrow.

Implications:

• This case underscores the importance of considering rare vascular malignancies like splenic angiosarcoma in the differential diagnosis of bone marrow biopsies with spindled cells.
• It highlights the diagnostic dilemma posed by overlapping features, emphasizing the need for comprehensive evaluation.
• Understanding these rare presentations is vital for improving diagnostic accuracy and patient outcomes in oncology and pathology.