Isolated complex renal cyst mimicking kidney mass.

Hydatidosis is an endemic parasitic disease in Mediterranean region, Middle east, Australia, parts of Africa, Latin America and Turkey. The cysts are mostly evident in the liver or lungs, while urinary tract involvement is uncommon, comprising only 2-4 % of all cases. Isolated renal involvement is extremely rare. Its diagnosis may be difficult because of nonspecific complaints and absence of pathognomonic laboratory findings except from hydatiduria. Although radiological studies have a more important role in the diagnosis, they cannot always show a specific sign or lesion for hydatid disease. Herein we present a rare case with isolated renal hydatid cyst mimicking a renal mass treated with right radical nephrectomy. Isolated renal cyst hydatid should be considered in differential diagnosis of both cystic and solid renal masses.

Atypical presentations of retroperitoneal giant schwannomas.

Schwannomas are usually benign rare tumors that originating from Schwann cells of peripheral nerve sheaths. Presentation is generally varied and changed in a non-specific range from abdominal mass, flank pain to incidental findings. Herein we report 2 cases of retroperitoneal giant schwannomas with different clinical presentations, of whom one presented with vague abdominal pain, palpable abdominal mass for 4 years, swelling and bilateral hydronephrosis that caused by giant abdominal mass; the other one presented with right flank pain, rectal hemorrhage and lower extremities edema. Two patients were treated by complete surgical excision of masses. The histological and immunohistochemical diagnosis was reported as benign schwannoma. Both of patients are doing well and had no recurrence in 9 years and 28 months follow-up, respectively.