Breast Pathology
Our Breast Pathology service provides diagnostic expertise in benign and malignant diseases of the breast, directed by fellowship-trained breast pathologists. Our focus is on high quality, evidence-based pathology with clear reports and easy access for our clinical colleagues, with whom we work very closely. Breast cases are signed out by one of our 3 breast pathologists, inclusive of two pathologists with dedicated fellowship training in breast pathology at Mayo Clinic. All new malignant diagnoses, challenging cases, and many benign diagnoses are reviewed in consensus within the team to ensure highest quality care for patients.
Our team participates in the weekly breast tumor board, providing key pathologic diagnostic information, allowing our clinical colleagues to make informed treatment decisions. We provide next day turnaround for most biopsies inclusive of estrogen and progesterone receptor testing, with complete HER-2 testing generally completed within 7 business days. We also offer molecular companion diagnostics at clinical request including PDL-1, PIK3CA, and Foundation One. Any of our pathologists are always available to discuss specific cases, emerging concepts in breast pathology, radiology-pathology correlation, or anything else related to the world of breast pathology.

Dr. Kaitlyn Nielson directs our breast pathology service and completed Anatomic and Clinical Pathology Residency at University of New Mexico, followed by Surgical Pathology and Breast Pathology fellowships at Mayo Clinic.

Dr. Toshi Ghosh competed her Anatomic and Clinical Pathology residency at Mayo Clinic. She then pursued two fellowships at Mayo Clinic, including Surgical Pathology and Multidisciplinary Breast Pathology, with advanced training in high-complexity breast diagnostics and multidisciplinary care.

Dr. Aamir Ahsan completed Anatomic and Clinical Pathology Residency at Danbury Hospital, affiliated with The Yale University School of Medicine, and Hematopathology fellowship at Indiana University School of Medicine.
Any of our pathologists are always available to discuss specific cases, emerging concepts in breast pathology, radiology-pathology correlation, or anything else!
Tel. 805-569-7367
Kaitlyn Nielson, MD knielson@sbch.org
Emily Waterhouse, MD PhD ewaterhouse@sbch.org
Aamir Ahsan aahsan@sbch.org

