TY - JOUR
T1 - Hyporeflective pagetoid cells
T2 - A new clue for amelanotic melanoma diagnosis by reflectance confocal microscopy
AU - Losi, A.
AU - Longo, C.
AU - Cesinaro, A. M.
AU - Benati, E.
AU - Witkowski, A.
AU - Guitera, P.
AU - Pellacani, G.
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2014
Y1 - 2014
N2 - Background Amelanotic melanoma represents a diagnostic challenge both clinically and dermoscopically. Few studies based on case series have explored the possibility of using reflectance confocal microscopy (RCM) to diagnose amelanotic melanoma. Objectives To validate a new confocal feature, named hyporeflective pagetoid cells (HPCs), for the diagnosis of amelanotic melanoma. Methods A group of 20 amelanotic melanomas and a control population of nonpigmented melanocytic naevi (10), hypo/nonpigmented nonmelanocytic lesions (20) and pigmented melanomas (20), imaged by RCM, were retrospectively evaluated. The presence of HPCs and other diagnosis-specific confocal features was assessed and correlated with histopathology. Results HPCs were present, and usually abundant, in the majority of amelanotic melanomas (85%). As expected, they were also observed in Spitz naevi. On histopathology, they were correlated with pagetoid infiltration of hypomelanotic melanocytes in all melanocytic lesions. Few nonmelanocytic lesions (three squamous cell carcinomas, two seborrhoeic keratoses and one basal cell carcinoma) showed the presence of HPCs. In these cases, they corresponded to enlarged or dyskeratotic keratinocytes by histopathology. Conclusions The identification of HPCs in the epidermis is a new parameter that is frequently found in amelanotic melanoma. Possible confounders are represented by atypical keratinocytes that can be present in nonmelanocytic lesions. However, the whole architecture and the presence of additional diagnostic criteria should be considered in order to obtain a correct diagnosis. What's already known about this topic? Amelanotic and hypopigmented lesions can be readily evaluated by means of confocal microscopy. Few reports have explored the characteristic confocal aspects of amelanotic melanoma as seen by confocal microscopy. What does this study add? We define a new descriptor, named hypomelanotic pagetoid cells, as a clue for differentiating amelanotic melanoma from other benign and malignant nonpigmented lesions.
AB - Background Amelanotic melanoma represents a diagnostic challenge both clinically and dermoscopically. Few studies based on case series have explored the possibility of using reflectance confocal microscopy (RCM) to diagnose amelanotic melanoma. Objectives To validate a new confocal feature, named hyporeflective pagetoid cells (HPCs), for the diagnosis of amelanotic melanoma. Methods A group of 20 amelanotic melanomas and a control population of nonpigmented melanocytic naevi (10), hypo/nonpigmented nonmelanocytic lesions (20) and pigmented melanomas (20), imaged by RCM, were retrospectively evaluated. The presence of HPCs and other diagnosis-specific confocal features was assessed and correlated with histopathology. Results HPCs were present, and usually abundant, in the majority of amelanotic melanomas (85%). As expected, they were also observed in Spitz naevi. On histopathology, they were correlated with pagetoid infiltration of hypomelanotic melanocytes in all melanocytic lesions. Few nonmelanocytic lesions (three squamous cell carcinomas, two seborrhoeic keratoses and one basal cell carcinoma) showed the presence of HPCs. In these cases, they corresponded to enlarged or dyskeratotic keratinocytes by histopathology. Conclusions The identification of HPCs in the epidermis is a new parameter that is frequently found in amelanotic melanoma. Possible confounders are represented by atypical keratinocytes that can be present in nonmelanocytic lesions. However, the whole architecture and the presence of additional diagnostic criteria should be considered in order to obtain a correct diagnosis. What's already known about this topic? Amelanotic and hypopigmented lesions can be readily evaluated by means of confocal microscopy. Few reports have explored the characteristic confocal aspects of amelanotic melanoma as seen by confocal microscopy. What does this study add? We define a new descriptor, named hypomelanotic pagetoid cells, as a clue for differentiating amelanotic melanoma from other benign and malignant nonpigmented lesions.
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U2 - 10.1111/bjd.12781
DO - 10.1111/bjd.12781
M3 - Article
C2 - 24329036
AN - SCOPUS:84904908448
SN - 0007-0963
VL - 171
SP - 48
EP - 54
JO - British Journal of Dermatology
JF - British Journal of Dermatology
IS - 1
ER -