tubulocystic renal cell carcinoma
Tubulocystic renal cell carcinoma is an extremely rare subtype of renal cell carcinoma most frequently characterized by a small, solitary, well-circumscribed, unencapsulated renal tumor composed of multiple small to medium-sized cysts with a white or gray, spongy ("bubble wrap-like") cut surface. Patients are usually asymptomatic or could manifest with abdominal pain, abdominal distension and/or hematuria. Progression, recurrence and metastasis rarely occur although lymph node, bone, pleura and liver mestatsis have been reported.