Integrating molecular analyses with the 2021 WHO classification of adult pilocytic astrocytomas.

Pilocytic astrocytomas (PAs) are benign grade 1 gliomas according to the World Health Organization (WHO). They are common in children but rare in adults in whom they may have a worse prognosis. Pediatric PAs are usually associated with dysregulation of the mitogen-activated protein kinase (MAPK) pathway, often involving BRAF alterations such as the KIAA1549::BRAF (K-B) fusion or V600E mutation.

Intestinal spirochetosis: four cases with different clinical presentations.

We present 4 clinical cases of intestinal spirochetosis. The first one presents with chronic diarrhea, and spirochetes are detected in random biopsies. The second is homosexual, HIV+, presents rectal bleeding, colonoscopy shows a straight ulcer and spirochete biopsies show negative treponema PCR.

A rare endoscopic finding: primary esophageal melanoma.

We report a case of a patient accidentally diagnosed with an esophageal lesion compatible (histologically and immunohistochemically) with epithelioid melanoma. The skin examination did not reveal any evidence of melanoma and the patient was diagnosed with primary malignant melanoma of the esophagus. It's a very rare tumour.

Sudden Death Due to Thrombosis Associated with Implantable Cardioverter-Defibrillator Electrodes.

Unlabelled: Thrombosis associated with pacemaker leads is extremely rare, although the literature on this subject is scarce. A clinical case is reported, describing this condition and its clinical presentation, the complementary tests for establishing the diagnosis and the available therapeutic options.

Learning Points: Thrombosis associated with pacemaker leads is extremely rare.

Craniopharyngiomas: A clinicopathological and molecular study of 52 cases - Experience in the Complejo Hospitalario de Toledo and Hospital Universitario 12 de Octubre (Madrid).

Craniopharyngiomas (CPs) are histologically benign tumors that are associated with high levels of morbidity. Two clinicopathological variants - adamantinomatous (ACP) and papillary (PCP) - have been described. They differ in their molecular features, whereby activating mutations in (V600E) and genes characterize PCP and ACP, respectively.

[Intratumoral endometriosis in renal angiomyolipomas associated to medium vessel necrotizing vasculitis in a patient with Wünderlich syndrome. A rare finding].

Spontaneous perirenal hematoma or Wünderlich syndrome is a rare entity that requires urgent attention. The most frequent causes are renal neoplasms, mainly renal angiomyolipoma, and vascular diseases (vasculitis). We present a case of a woman with a history of renal angiomyolipomas associated with tuberous sclerosis complex, who developed Wünderlich's syndrome associated with medial vessel vasculitis as well as an uncommon instance of intratumoral endometriosis.