RESUMEN
We present a case of immunohistochemically proven primary mantle cell lymphoma of appendix that presented as a mass in right iliac fossa. The usual presentation of gastrointestinal mantle cell lymphoma is in the form of multiple lymphomatous polyposis. Mantle cell lymphoma has a unique immunohistochemistry and genetic abnormality.
RESUMEN
Carcinosarcoma, a malignant tumor with biphasic morphology is uncommon in the renal pelvis. Immunohistochemistry (IHC) plays an important role in establishing the diagnosis and differentiating it from other biphasic malignant tumors. We present a rare case of immunohistologically confirmed carcinosarcoma of renal pelvis in a 42-year old female, which possibly developed on a background of multicentric squamous cell carcinoma arising as a consequence of chronic irritation caused by calculi.