Hydatidosis is a parasitosis produced by Echinococcus larvae, which form cysts frequently located in the liver and lung; Renal location has only been reported in 4% of visceral forms. We present the case of a 19-year-old man from Lima, who came to our hospital with pain in the left flank and hematuria, a tomography was performed suggestive of complicated simple cyst. A nephrectomy is performed and the piece is sent to the Pathology Department, in which they observe cystic formation inside which multiple folded whitish membranes are observed: in the microscopic examination anhistic membranes are observed, consistent with a renal hydatid cyst.

Chondrosarcoma is a skeletal malignant neoplasm characterized by the production of neoplastic cartilage, it represents only 20% of bone tumors, and its most frequent location is in the pelvis and proximal extremities. Location in small bones is very rare. A 44-year-old man with a 1-year illness who attended the trauma emergency at the hospital with an increase in volume of the back of the right foot accompanied by intense pain. A wide margin resection of the tumor was performed. The pathology department reported high-grade chondrosarcoma. Currently the patient is evaluated by the oncology service.

Acute gastric dilation is based on two theories, the mechanical one that is explained by the superior mesenteric artery syndrome and the atonic one; The latter is the product of a medical condition in which the stomach progressively becomes hypotonic and over-distended even in the absence of an obstructive mechanical cause; it most often occurs in patients with eating disorders; which can lead to a rare but fatal complication such as gastric perforation; We present the case of an 18-year-old patient who comes to the emergency service of our hospital with acute abdominal pain, undergoes surgery, where there is perforation of the anterior gastric wall, and a proximal partial gastrectomy is performed, and a sends the specimen for pathology study. Histopathology shows transmural necrosis predominantly in the gastric fundus.

Bullous systemic lupus erythematosus (BSLE) is a vesiculobullous disease mediated by autoantibodies in patients with systemic lupus erythematosus (SLE). Tense vesicles and bullae are seen on an edematous, erythematous and sometimes normal skin in any body region, including mucous membranes and non-photoexposed areas. This is the case of a 16-year-old male patient with lupus nephritis who, on the seventh day of hospitalization, presented multiple serous and hemorrhagic blisters on the face, trunk, abdomen and upper extremities. The histological study showed a subepidermal bullousdermatosis with numerous neutrophils.