The utility of fine-needle aspiration in the diagnosis of gastrointestinal stromal tumors: a cytomorphologic and immunohistochemical analysis with emphasis on malignant tumors.

Background: Gastrointestinal stromal tumors (GISTs) are the most common mesenchymal neoplasms of the tubular gut and mesentery. Fine-needle aspiration biopsy (FNAB) currently is a useful tool in the diagnosis of GIST because of various mutations of the KIT protooncogene that are recognized as characteristic of these tumors. Despite such advances, the malignant potential of GIST remains variable, and few studies have reported their findings in patients with malignant GIST.

Coccidioidomycosis osteomyelitis masquerading as a bone tumor. A report of 2 cases.

Background: Coccidioidomycosis involving the lung is common in endemic areas. However, it is unusual for it to present as a solitary bone lesion.

Cases: Two cases of Coccidioides immitis osteomyelitis clinically and radiographically mimicked a primary bone tumor.