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Biomedical subjects

F J Hahn

Publications and source records attributed to F J Hahn.

43 records · Page 3Linked to original sources
PubMedDate not supplied

Cerebellar hemangioblastoma with prominent stromal astrocytosis: diagnostic and histogenetic considerations.

A cerebellar hemangioblastoma with atypical radiologic and morphologic features is reported. On computed tomography this tumor presented as a single ring-enhancing mass in the right cerebellar hemisphere without adjacent cyst formation. It was radiologically indistinguishable from an abscess or malignant neoplasm. Postmortem examination demonstrated a circumscribed, cystic neoplasm arising in the pia at the base of a sulcus. Microscopically, the tumor contained a prominent astrocytic component that mimicked the appearance of a highly vascular astrocytoma. Hemangioblastomas with this degree of astrocytosis are unusual. They must be distinguished pathologically from both cystic astrocytoma and mixed hemangioblastoma-glioma (angioglioma).

Aged↗
PubMedDate not supplied

A new method for treatment of unresectable, recurrent brain tumors with single permanent high-activity 125iodine brachytherapy.

We describe a new method for treating unresectable recurrent brain tumors in previously-irradiated patients with localized high-dose intracranial brachytherapy of 10,000-30,000 rads using permanent implantation of a single high-activity 125Iodine seed. For unresectable recurrent previously-irradiated pituitary tumors, a single high-activity 125Iodine seed is permanently implanted into the center of the tumor with an interstitial needle inserted under fluoroscopic guidance via a transsphenoidal approach. For unresectable recurrent meningiomas, a single high-activity seed is permanently implanted into the tumor at craniotomy. The clinical course of five patients treated by this method is described. Excellent long-term local control was obtained in all implanted cases. There were no intraoperative, postoperative, or chronic complications.

Adenoma↗
PubMedDate not supplied

Aneurysms of the posterior cerebral artery in children.

Intracranial aneurysms in children are very rare and differ from those in adults in several ways. Posterior cerebral artery (PCA) aneurysms are among the least common of intracranial aneurysms and little is known of their presentation and prognosis. Two cases of PCA aneurysms in children are reported, and 21 other cases of PCA aneurysms in patients 20 years of age or younger are reviewed. PCA aneurysms in children have a marked male predominance and are usually large, symptomatic, and tend to occur proximal or distal to the circle of Willis. Diagnostic computed tomography may be warranted earlier in children than in adults with similar symptoms referable to intracranial abnormalities because children are more likely to have an organic cause for such symptoms.

Cerebral Angiography↗