We are Canada's largest and most experienced group of pathologists. The staff's commitment to research, teaching and clinical services keeps them at the forefront of oncology, transplant, cardiovascular and neuroscience diagnostics.

Our pathologists have access to many integrated techniques including histology, immunohistochemistry, flow cytometry, electron microscopy, cancer cytogenetics and molecular diagnostics. These resources enable our team to provide opinions that meet the level of sophistication required by our clients.

Services range from consultations that provide diagnostic advice on complex cases, to routine interpretation of tests, collaborative diagnosis, and technical services.

Our areas of expertise include breast pathology, cardiovascular pathology, cytopathology, dermatopathology, endocrine pathology, gastrointestinal and hepatic pathology, genitourinary pathology, gynecologic pathology, head and neck pathology, hematopathology, neuropathology, pulmonary pathology and renal pathology.

Pathology Disciplines

Autopsy Services

Learn more about LMP's Autopsy Services.


The Cytopathology Department diagnoses diseases on a cellular level. We typically support the diagnosis of cancer.


  • Fine Needle Aspiration and Non-Gynecologic Cytology with Morphologic, Proteomic and Genomic Tumour Analyses
  • Liquid-based Gynecologic (Pap Test) Cytology and HPV Testing

Electron Microscopy

The Electron Microscopy Department uses ultrastructural analysis of cells and microorganisms by Transmission Electron Microscope. High-resolution digitized images are captured and ultrastructural measurements are made for the diagnosis of diseases with ultrastructural footprint.


The Histopathology Department performs a wide range of histological techniques including processing, embedding and staining of tissue sections for initial diagnosis. Special stains demonstrate microorganisms, certain cell types and special structures in tissue. Enzyme histochemistry is used for diagnosis of neuromuscular diseases.


The Immunopathology Department performs immunohistochemical assays, both diagnostic and predictive, which help UHN Pathologists and oncologists plan the best personalized patient treatment options. Our laboratory uses state-of-the-art platforms, enabling implementation of rare assays. Specialized Immunofluorescence studies focusing on kidney and skin biopsies are performed and used by UHN renal pathologists and dermatopathologists.

Surgical Pathology

Surgical Pathology receives and evaluates all tissue specimens collected from across the hospital and consult material from other hospitals.

Our team of pathologists' assistants, with support from pathologists, handle, dissect and sample the specimens received in the Surgical Pathology lab as well as LMP's Autopsy Services. After microscopic review, a diagnosis is made by a pathologist and shared with a physician.


  • Fee for service; Animal and Human research studies
  • Routine histological services, whole-mount tissue processing

Visit LMP's Research, Innovation and Support Solutions section for more information.

View and download requisition forms 


Dr. Ilan Weinreb 
Rosetta Belcastro 

Senior Manager: Rosetta Belcastro
Pathology Operations and Administrative Services
416 340 4800 ext. 8662

Administrative Assistant: Melissa Skarban | 416 340 4800 ext. 3008 |

Anatomical Pathology Staff

  • Dr. Michael Seidman, Division Director

  • Dr. Zaid Kamil
  • Dr. Stephen Smith

  • Dr. Klaudia Nowak
  • Dr. Sangeetha Kalimuthu
  • Dr. Stefano Serra
  • Dr. Raj Vajpeyi, Deputy Medical Director, Timmins & District Hospital

  • Dr. Carol Cheung, Lab Director, Immunohistochemistry
  • Dr. Theodorus Van der Kwast, Division Director, Research
  • Dr. Joan Sweet

  • Dr. Phedias Diamandis
  • Dr. Andrew Gao
  • Dr. Gabor Kovacs


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