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Zorluk: OrtaPathology and Biopsy Interpretation

A 5555-year-old woman is evaluated in the surgical oncology clinic to discuss the final pathology report from her recent total thyroidectomy. The surgery was performed after a fine-needle aspiration of a 2.52.5 cm solid, hypoechoic right thyroid nodule with microcalcifications returned as suspicious for malignancy. The preliminary intraoperative frozen section revealed complex branching structures with central fibrovascular cores. Based on this patient's presentation and architectural tissue findings, which of the following cytopathologic and histopathologic features are expected in the final synoptic report to establish the definitive diagnosis? (Select all that apply)

  1. Optically clear nuclei with longitudinal grooves and pseudoinclusionsCevap
  2. Laminated, concentrically calcified spherulesCevap
  3. C
    Extracellular stroma exhibiting apple-green birefringence under polarized light
  4. D
    Tumor cell invasion through the fibrous capsule and into adjacent blood vessels
  5. E
    Extensive infiltration by atypical lymphoid cells with prominent germinal centers

Cevap

The expected features are optically clear nuclei with longitudinal grooves/pseudoinclusions and laminated, concentrically calcified spherules.
The patient's nodule demonstrates a true papillary architecture (branching structures with fibrovascular cores). To confirm a diagnosis of papillary thyroid carcinoma (PTC), the pathologist must identify its pathognomonic nuclear features: large, optically clear nuclei with marginalized chromatin ('Orphan Annie eyes'), longitudinal nuclear grooves, and intranuclear pseudoinclusions. Additionally, the microcalcifications noted on the preoperative ultrasound strongly correlate with psammoma bodies, which appear microscopically as laminated, concentrically calcified spherules. Both of these features establish the definitive diagnosis of PTC.

Adım Adım Çözüm

1
Analyze the stem's architectural description.
The biopsy shows 'complex branching structures with central fibrovascular cores'.
This is the classic microscopic definition of a true papilla, highly suggestive of papillary thyroid carcinoma (PTC) in the context of a thyroid nodule.
2
Correlate the architectural findings with the expected cytopathology and microcalcifications.
PTC is defined by unique nuclear changes and the frequent presence of psammoma bodies.
Identifying the constellation of histopathologic signs required to confirm a diagnosis is a core biopsy interpretation skill.
3
Select the specific pathologic findings that match PTC.
Select the options describing optically clear, grooved nuclei and concentrically calcified spherules.
These findings fulfill the diagnostic criteria for PTC.

Anahtar Kavram

Papillary thyroid carcinoma is diagnosed primarily based on classic nuclear features (optically clear 'Orphan Annie' nuclei, nuclear grooves, pseudoinclusions) and is often accompanied by psammoma bodies (laminated calcifications) and a true papillary architecture (fibrovascular cores).
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Pathology and Biopsy Interpretation

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