Publications by authors named "Giorgio G Carrabba"

3 Publications

  • Page 1 of 1

The suprasellar volume of nonfunctioning pituitary adenomas: a useful tool for predicting visual field deficits.

Pituitary 2020 Oct;23(5):552-557

Department of Neurosurgery, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, University of Milan, Via Francesco Sforza, 20122, Milan, Italy.

Purpose: The aim of the present study is to assess the predictive value of the suprasellar volume (SSV) of nonfunctioning pituitary adenomas (NFPAs) for visual field (VF) impairment in order to guide clinical decision-making and improve neurosurgical management.

Methods: Two independent samples of patients with NFPAs (exploratory population N = 50, testing population N = 98) were included in the present study. In the first phase, we determined the optimal cut-off value of the SSV correlating with VF deficits in the exploratory population. In the second phase, we then studied the accuracy of identified cut-off in predicting a VF deficit in the testing population.

Results: In the exploratory population, the optimal cut-off value of the SSV to determine the presence of a VF deficit was 1.5 mL. Sensitivity and specificity of the cut-off were 81.3 and 100%, respectively. The positive predictive value (PPV) and the negative predictive value (NPV) were 100 and 75%, respectively. When we checked the identified cut-off score on the testing population, we found a sensitivity of 71% and a specificity of 100%. The PPV and NPV were 100 and 59.2%, respectively. In six cases with VF defects and SSV inferior to 1.5 mL, the displacement of optic chiasm was in superior position.

Conclusion: The SSV may represent an accurate method in routinely clinical practice for predicting VF deficit in patients affected by NFPA.
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October 2020

Cushing's disease: a prospective case-control study of health-related quality of life and cognitive status before and after surgery.

J Neurosurg 2019 Nov 15:1-11. Epub 2019 Nov 15.

2Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan.

Objective: Some studies have highlighted psychological and neuropsychological difficulties and a potential reduction in health-related quality of life (HRQOL) in patients with pituitary tumors, despite hormone deficits or excess. To the authors' knowledge, this study is the first prospective longitudinal case-control study with the aim of simultaneously testing whether HRQOL and psychiatric and neuropsychological disabilities are related to neural dysfunction due to hypercortisolism per se, or tumor mass and/or surgery in patients with Cushing's disease (CD). The authors evaluated a homogeneous cohort of patients with CD and nonfunctioning pituitary adenomas (NFPAs) before and after neurosurgery and compared these patients with healthy controls.

Methods: Twenty patients (10 with NFPA and 10 with CD) were evaluated using 3 validated questionnaires (SF-36, Beck Depression Inventory-II [BDI-II], and Minnesota Multiphasic Personality Inventory-II [MMPI-II]) to assess HRQOL and psychological status preoperatively and 12 months after neurosurgery. Neuropsychological tests were assessed preoperatively, 3-7 days postoperatively, and 12 months postoperatively. Twenty healthy matched controls were recruited.

Results: Preoperatively, the NFPA and CD subgroups had worse HRQOL scores than controls on the basis of SF-36 scores, although the NFPA subgroup experienced significant recovery 12 months postoperatively. Preoperatively, CD patients had depressive symptoms according to the BDI-II and MMPI-II that persisted 12 months postoperatively, together with social introversion and hypochondriasis; NFPA patients were similar to controls except for hypochondriasis scores that were clinically significant at all timepoints. Preoperatively and 3-7 days postoperatively, both subgroups showed significant neuropsychological disabilities compared with controls, but only the CD subgroup did not completely recover over time.

Conclusions: HRQOL and neuropsychological impairments were observed in all patients at early timepoints, independent of hypercortisolism, tumor mass, and successful surgery. Over time, CD patients showed persistent changes in HRQOL, in particular in social activities. In this light, CD seems to have a strong impact on HRQOL and to be associated with more psychological and neuropsychological comorbidities than NFPA.
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November 2019

Optic Radiation Diffusion Tensor Imaging Tractography: An Alternative and Simple Technique for the Accurate Detection of Meyer's Loop.

World Neurosurg 2018 Sep 30;117:e42-e56. Epub 2018 May 30.

Unit of Neurosurgery, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.

Background: The optic radiation (OR) is a white matter bundle with a very complex anatomy. Its anterior component bends sharply around the tip of the temporal horn, forming the Meyer's loop (ML), the sparing of which during surgery is crucial to preserve visual function. Defining its exact anatomy and accurately identifying its position remain challenging, even with diffusion tensor imaging (DTI) tractography and the most refined tracking procedure. We have developed an alternative tracking technique to detect the ML position.

Methods: We performed DTI studies in 26 patients undergoing resection of a temporo-parieto-occipital lesion. We then reconstructed the ORs of each patient using 2 techniques (the first developed by our team, the other taken from the literature), using the same tracking software and parameters. We evaluated the accuracy of each technique measuring 3 distances that define the ML position. We created 5 data groups and compared the 2 techniques. Finally, we compared our results with the results from 8 anatomic dissection studies and other tractographic studies.

Results: Our findings show that our technique allows a more accurate definition of the ML position. We found a statistically significant (P < 0.05) difference for all the distances between the 2 techniques; our results resemble those obtained in dissection studies. Our technique is also easy to perform and repeatable.

Conclusions: Our tracking technique may be of marked interest for the evaluation and anatomic definition of the ML position, particularly for neurosurgeons approaching the anterior temporal region.
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September 2018