Splenic Rupture Secondary to Metastatic Undifferentiated Pleomorphic Sarcoma of the Spleen: A Rare Presentation of an Exceptionally Rare Entity.

Splenic malignancies are uncommonly encountered in routine practice, and they are often only detected incidentally, posing a clinical challenge. Primary malignant neoplasms of the spleen are rare, and sarcomas are by far the rarest. The undifferentiated pleomorphic sarcoma type is an exceptionally rare and aggressive type with only a handful of cases reported in literature thus far. Herein, we present the case of a 49-year-old, with a previous finding of a heterogeneous splenomegaly on imaging for an unrelated medical complaint, presenting with an acute abdomen secondary to a ruptured spleen. The diagnosis of high-grade primary undifferentiated pleomorphic sarcoma of the spleen was made, and with further investigations, suspicious hepatic lesions were identified and later confirmed to be metastases.