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Zorluk: ZorPathology and Biopsy Interpretation

A 52-year-old man presents for evaluation of a new, irregularly pigmented 8-mm macule on his left shoulder. An excisional biopsy with 2-mm margins is performed. The synoptic pathology report reveals an asymmetric, poorly circumscribed proliferation of atypical melanocytes present as single cells and in variable-sized nests. These cells exhibit prominent upward pagetoid scatter throughout the full thickness of the epidermis. Atypical melanocytes are also noted invading the papillary and superficial reticular dermis to a measured depth of 1.1 mm from the epidermal granular layer. There is no evidence of surface ulceration, and the dermal mitotic rate is 2 mitoses per square millimeter. Deep and peripheral margins are free of tumor. Based on the interpretation of this pathology report, which of the following statements are correct? (Select all that apply)

  1. The combination of prominent pagetoid scatter and dermal invasion confirms the diagnosis of invasive malignant melanoma.Cevap
  2. The measured tumor thickness of 1.1 mm is a pathologic staging criterion that indicates a need for sentinel lymph node biopsy.Cevap
  3. C
    The absence of surface ulceration demonstrates that the lesion is confined above the epidermal basement membrane.
  4. D
    The presence of dermal mitoses is a reassuring feature typically seen in benign compound nevi.
  5. E
    The asymmetric architecture with full-thickness pagetoid scatter represents the expected histologic profile of a severely atypical dysplastic nevus.

Cevap

The correct statements are that the combination of pagetoid scatter and dermal invasion confirms the diagnosis of invasive malignant melanoma, and that the measured tumor thickness of 1.1 mm indicates a need for a sentinel lymph node biopsy.
The biopsy findings of asymmetric proliferation, full-thickness pagetoid scatter (upward migration of melanocytes into the epidermis), and dermal invasion are classic diagnostic hallmarks of invasive malignant melanoma. Furthermore, the Breslow depth (tumor thickness) is a critical staging parameter; according to current oncology guidelines, a Breslow depth greater than 0.8 mm is a standard indication to offer a sentinel lymph node biopsy for accurate nodal staging.

Adım Adım Çözüm

1
Analyze the architectural and cytologic features described in the pathology report.
The report describes asymmetric proliferation, full-thickness pagetoid scatter of atypical melanocytes, and dermal invasion.
To differentiate between a benign nevus, an atypical/dysplastic nevus, and a malignant melanoma.
2
Identify the significance of tumor depth and staging criteria.
The tumor invades the dermis with a Breslow depth of 1.1 mm, confirming invasive disease rather than in situ.
To determine the depth of invasion, which is the most critical prognostic factor and dictates surgical management.
3
Apply clinical guidelines based on the pathologic staging.
A Breslow depth greater than 0.8 mm warrants a recommendation for a sentinel lymph node biopsy.
To properly evaluate for occult regional lymph node metastasis in intermediate-thickness melanomas.

Anahtar Kavram

Interpretation of primary cutaneous melanoma biopsy features and application of Breslow depth for surgical staging.
Tahmini Süre:1m 30s
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Pathology and Biopsy Interpretation

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