HNL News

June 29, 2022

Automation in the Clinical Laboratory

Clinical laboratory automation is essential to deliver high quality results in the most cost effective and efficient way.  Automation requires minimal operator intervention and helps to increase productivity, tracking of specimens within the laboratory, decreased turnaround times, improvements in specimen handling, improved laboratory safety, and minimizes errors.
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June 17, 2022

LYME Disease

As you continue to spend more time outside enjoying the weather, you’ll be sharing your space with some critters you’ll want to be aware of. Deer ticks can carry the bacteria that causes Lyme disease, which can have a critical impact on your health if untreated.
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June 15, 2022

Men's Health Month

In 1994, Congress designated the month of June as Men's Health Month to heighten the awareness of preventable health problems and encourage early detection and treatment of disease among men and boys.
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June 10, 2022

LGBTQ Pledge

HNL Lab Medicine believes the diversity of our workforce makes us stronger. We are committed to fostering, cultivating and preserving a culture of diversity, equity and inclusion. We strive to attract, develop, and retain a diverse and inclusive workforce.
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June 09, 2022

HNL Lab Medicine Artwork Contest Celebrates Healthcare Heroes

Throughout the month of May, HNL Lab Medicine, a regional leader in high-quality, innovative laboratory medicine services, announced an artwork contest for children in grades K-8. The goal of this contest was to promote awareness of the healthcare field, encourage creativity, and include a valuable connection to the community in each of HNL’s patient service centers.
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Michael W. Johnson


Medical and Forensic Pathologist/Neuropathologist

Dr. Johnson received his PhD in Neuroscience from the University of California, Los Angeles and his MD from the Northwestern University, Feinberg School of Medicine, in Chicago. He completed his residency in anatomic and neuropathology at The Johns Hopkins University School of Medicine in Baltimore and his fellowship in forensic pathology at the State of Maryland Office of the Chief Medical Examiner. Before joining Health Network Laboratories, Dr. Johnson was a medical examiner for the state of Kentucky. Dr. Johnson is certified by the American Board of Pathology in Anatomic and Neuropathology and Forensic Pathology, and is a member of the American Academy of Forensic Sciences and the National Association of Medical Examiners. Dr. Michael Johnson is a Clinical Assistant Professor at University of South Florida (USF), Morsani College of Medicine.


Solid pseudopapillary neoplasm, pancreas type, presenting as a primary ovarian neoplasm.
Stoll LM, Parvataneni R, Johnson MW, Gui D, Dorigo O, Sullivan P. Hum Pathol. 2012 Aug;43(8):1339-43. doi: 10.1016/j.humpath.2011.12.018. Epub 2012 Apr 24. PMID: 22534259

Axonal injury in young pediatric head trauma: a comparison study of β-amyloid precursor protein (β-APP) immunohistochemical staining in traumatic and nontraumatic deaths.
Johnson MW, Stoll L, Rubio A, Troncoso J, Pletnikova O, Fowler DR, Li L. J Forensic Sci. 2011 Sep;56(5):1198-205. doi: 10.1111/j.1556-4029.2011.01814.x. Epub 2011 May 19. PMID: 21595698

Papillary tissue fragments in cervicovaginal (Pap) smears: cytomorphologic characteristics and clinicopathologic significance.
Stoll LM, Johnson MW Ali SZ. Diagn Cytopathol. 2011 Sep;39(9):657-62. doi: 10.1002/dc.21443. Epub 2010 Oct 14. PMID: 20949454

High-grade prostatic sarcoma seen in a catheterized urine specimen: case report and differential diagnosis.
Stoll LM, Johnson MW, Rosenthal DL. Diagn Cytopathol. 2011 Oct;39(10):762-6. doi: 10.1002/dc.21545. Epub 2010 Oct 1. PMID: 20890999

Glioblastoma multiforme in the Muir-Torre syndrome.
Binder ZA, Johnson MW, Joshi A, Hann CL, Griffin CA, Olivi A, Riggins GJ, Gallia GL. Clin Neurol Neurosurg. 2011 Jun;113(5):411-5. doi: 10.1016/j.clineuro.2010.12.011. Epub 2011 Feb 1. PMID: 21288634

Acute myeloid leukemia with myelodysplasia-related changes with erythroid differentiation involving pleural fluid: a case report and brief cytopathologic review.
Stoll LM, Duffield AS, Johnson MW, Ali SZ. Diagn Cytopathol. 2011 Jun;39(6):451-4. doi: 10.1002/dc.21470. Epub 2010 Oct 17. Review. PMID: 20954271

Rapid malignant transformation of low-grade astrocytomas: report of 2 cases and review of the literature.
Frazier JL, Johnson MW, Burger PC, Weingart JD, Quinones-Hinojosa A. World Neurosurg. 2010 Jan;73(1):53-62; discussion e5. doi: 10.1016/j.surneu.2009.05.010. Epub 2009 Aug 7. Review. PMID: 20452869

Lipoglioblastoma: a lipidized glioma radiologically and histologically mimicking adipose tissue.
Johnson MW, Lin D, Smir BN, Burger PC. World Neurosurg. 2010 Feb;73(2):108-11. doi: 10.1016/j.surneu.2009.07.036. Epub 2009 Oct 13. PMID: 20860936

The utility of napsin-A in the identification of primary and metastatic lung adenocarcinoma among cytologically poorly differentiated carcinomas.
Stoll LM, Johnson MW, Gabrielson E, Askin F, Clark DP, Li QK. Cancer Cytopathol. 2010 Dec 25;118(6):441-9. doi: 10.1002/cncy.20108. Epub 2010 Sep 9. PMID: 20830690

Spectrum of pilomyxoid astrocytomas: intermediate pilomyxoid tumors.
Johnson MW, Eberhart CG, Perry A, Tihan T, Cohen KJ, Rosenblum MK, Rais-Bahrami S, Goldthwaite P, Burger PC. Am J Surg Pathol. 2010 Dec;34(12):1783-91. doi: 10.1097/PAS.0b013e3181fd66c3. PMID: 21107083

Cytologic diagnosis and differential diagnosis of lung carcinoid tumors a retrospective study of 63 Cases with histologic correlation.
Stoll LM, Johnson MW, Burroughs F, Li QK. Cancer Cytopathol. 2010 Dec 25;118(6):457-67.PMID:21243734

Intramedullary amputation neuromas associated with spinal ependymomas.
Johnson MW, Burger PC. Am J Surg Pathol. 2009 Apr;33(4):639-43. doi: 10.1097/PAS.0b013e31818fe3c9. PMID: 19065100

Angiocentric glioma: a case series.
Shakur SF, McGirt MJ, Johnson MW, Burger PC, Ahn E, Carson BS, Jallo GI. J Neurosurg Pediatr. 2009 Mar;3(3):197-202. doi: 10.3171/2008.11.PEDS0858. Review. PMID: 19338465 Free PMC Article

Loss of expression of tuberin and hamartin in tuberous sclerosis complex-associated but not in sporadic angiofibromas.
Fackler I, DeClue JE, Rust H, Vu PA, Kutzner H, Rütten A, Kaddu S, Sander CA, Volkenandt M, Johnson MW, Vinters HV, Wienecke R. J Cutan Pathol. 2003 Mar;30(3):174-7. PMID: 12641776

Ezrin and moesin expression within the developing human cerebrum and tuberous sclerosis-associated cortical tubers.
Johnson MW, Miyata H, Vinters HV. Acta Neuropathol. 2002 Aug;104(2):188-96. Epub 2002 Jun 5. PMID: 12111362

Hamartin and tuberin expression in human tissues.
Johnson MW, Kerfoot C, Bushnell T, Li M, Vinters HV. Mod Pathol. 2001 Mar;14(3):202-10. PMID: 11266527 Free Article

Hamartin expression and interaction with tuberin in tumor cell lines and primary cultures.
Catania MG, Johnson MW, Liau LM, Kremen TJ, deVellis JS, Vinters HV. J Neurosci Res. 2001 Feb 1;63(3):276-83. PMID: 11170177

The TSC1 tumour suppressor hamartin regulates cell adhesion through ERM proteins and the GTPase Rho.
Lamb RF, Roy C, Diefenbach TJ, Vinters HV, Johnson MW, Jay DG, Hall A. Nat Cell Biol. 2000 May;2(5):281-7. PMID: 10806479

Co-localization of TSC1 and TSC2 gene products in tubers of patients with tuberous sclerosis.
Johnson MW, Emelin JK, Park SH, Vinters HV. Brain Pathol. 1999 Jan;9(1):45-54. PMID: 9989450

Quantitative trait locus analysis of plasma lipoprotein levels in an autoimmune mouse model : interactions between lipoprotein metabolism, autoimmune disease, and atherogenesis.
Gu L, Johnson MW, Lusis AJ. Arterioscler Thromb Vasc Biol. 1999 Feb;19(2):442-53. PMID: 9974430 Free Article

Cortical dysplasia, genetic abnormalities and neurocutaneous syndromes.
Vinters HV, Park SH, Johnson MW, Mischel PS, Catania M, Kerfoot C. Dev Neurosci. 1999 Nov;21(3-5):248-59. Review. PMID: 10575248

Isolation and characterization of synaptoneurosomes from single rat hippocampal slices.
Johnson MW, Chotiner JK, Watson JB. J Neurosci Methods. 1997 Dec 1;77(2):151-6. PMID: 9489891