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Collision tumour is defined as the presence of two distinct tumours in the same organ without any histological intermixing. Such tumours involving ovaries are extremely rare. We are presenting report of two cases of ovarian collision tumour. Our first case revealed features of mature cystic teratoma with mucinous cystadenoma. The second case showed components of both mature cystic teratoma and serous cystadenoma. Correct diagnosis of collision tumour will guide the surgeon towards proper treatment and favorable prognosis of patient.

Squamous cell carcinoma, a rare malignancy of upper urinary tract accounts for 1.4% of all renal malignancies [1]. These tumours are mostly seen in the adults and less commonly in the pediatric age groups. Most of the cases present incidentally because they are masqueraded by pyonephrosis or hydonephrosis which occurs at an advanced stage of the disease and hence poor prognosis. A screening CT for long stand renal stone or newer imaging modalities are required for early detection and improving prognosis of the patients. Here we present a case of renal squamous cell carcinoma in 55 yrs old male with a staghorn calculus.