1-20 of 422 Search Results for

base

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Images
SPITZOID MELANOMA (OF CHILDHOOD)  A: The tumor is densely cellular with lac...
Published: 01 February 2024
SPITZOID MELANOMA (OF CHILDHOOD) Figure 19-6 SPITZOID MELANOMA (OF CHILDHOOD) A: The tumor is densely cellular with lack of maturation and tongue-like projections at the base. B: The tumor is composed of fusiform melanocytes, many of which are in mitosis. C: Tumor cells are present in the subca... More about this image found in SPITZOID MELANOMA (OF CHILDHOOD) A: The tumor is densely cellular with lac...
Images
PERSISTENT MELANOCYTIC NEVUS  A: A pigmented, predominantly intradermal nev...
Published: 01 February 2024
PERSISTENT MELANOCYTIC NEVUS Figure 6-6 PERSISTENT MELANOCYTIC NEVUS A: A pigmented, predominantly intradermal nevus is confined to the area of the scar. B: Solitary units of melanocytes are present at the dermoepidermal junction. The dermal melanocytes display large epithelioid cell features, b... More about this image found in PERSISTENT MELANOCYTIC NEVUS A: A pigmented, predominantly intradermal nev...
Images
SPITZOID MELANOMA MISDIAGNOSED AS SPITZ NEVUS  A: Symmetric silhouette of a...
Published: 01 February 2024
SPITZOID MELANOMA MISDIAGNOSED AS SPITZ NEVUS Figure 19-2 SPITZOID MELANOMA MISDIAGNOSED AS SPITZ NEVUS A: Symmetric silhouette of a compound pigmented spindle and epithelioid cell neoplasm in a young adult. There are clefts between junctional nests and adjacent hyperplastic epidermis. B: A few ... More about this image found in SPITZOID MELANOMA MISDIAGNOSED AS SPITZ NEVUS A: Symmetric silhouette of a...
Images
MELANOMA ARISING IN ASSOCIATION WITH AND SIMULATING A MELANOCYTIC NEVUS  A:...
Published: 01 February 2024
MELANOMA ARISING IN ASSOCIATION WITH AND SIMULATING A MELANOCYTIC NEVUS Figure 17-8 MELANOMA ARISING IN ASSOCIATION WITH AND SIMULATING A MELANOCYTIC NEVUS A: Most of the melanocytes are intradermal and display architectural disorder and atypia, but also some suggestion of maturation. Junctional ... More about this image found in MELANOMA ARISING IN ASSOCIATION WITH AND SIMULATING A MELANOCYTIC NEVUS A:...
Book Chapter
Series: Atlases of Tumor and Non-Tumor Pathology, Series 5
Volume: 19
Published: 01 February 2024
10.55418/9781933477428-23
ISBN-10: 1-933477-42-3
ISBN: 978-1-933477-42-8
... tumor cell layer and most deeply located invasive melanoma is used for measuring tumor thickness ( fig. 23-2 ). Any overlying cap of fibrin, if present, is excluded from the measurement. When a melanoma is broadly transected at the base of a shave or punch biopsy, for example, only a minimum measurement...
Book Chapter
Series: Atlases of Tumor and Non-Tumor Pathology, Series 5
Volume: 19
Published: 01 February 2024
10.55418/9781933477428-19
ISBN-10: 1-933477-42-3
ISBN: 978-1-933477-42-8
...The term spitzoid melanoma is used for a melanoma bearing some resemblance to a Spitz nevus ( 1 ). It is a diagnostic pitfall ( 2 ): a melanocytic neoplasm may at first glance look like an atypical Spitz nevus or Spitz tumor, but is eventually diagnosed as melanoma based on clinical follow...
Images
TRICUSPID VALVE  A: <span class="search-highlight">Base</span>-of-heart, viewed from <span class="search-highlight">base</span> toward apex. Annulus: n...
Published: 15 November 2023
TRICUSPID VALVE Figure 1-11 TRICUSPID VALVE A: Base-of-heart, viewed from base toward apex. Annulus: noncircular orifice (dashed line), with flattened segment adjacent to septal leaflet. The annular region associated with the anterior and posterior leaflets lies adjacent to the right coronary art... More about this image found in TRICUSPID VALVE A: Base-of-heart, viewed from base toward apex. Annulus: n...
Images
CARDIAC <span class="search-highlight">BASE</span>  <span class="search-highlight">Base</span> of heart with atria and great arteries removed, represen...
Published: 15 November 2023
CARDIAC BASE Figure 1-25 CARDIAC BASE Base of heart with atria and great arteries removed, representing right posterior oblique view, from base toward apex. A,B: Hearts shown in simulated ventricular diastole (A) and systole (B). C: Centrally, the aortic valve contacts the other three valves. M... More about this image found in CARDIAC BASE Base of heart with atria and great arteries removed, represen...
Images
CORONARY ARTERIES: <span class="search-highlight">BASE</span> OF THE HEART  <span class="search-highlight">Base</span>-of-heart depictions viewed from ...
Published: 15 November 2023
CORONARY ARTERIES: BASE OF THE HEART Figure 1-35 CORONARY ARTERIES: BASE OF THE HEART Base-of-heart depictions viewed from base toward apex, with atria and great arteries removed. Left: Diagram shows right coronary dominance. Right: In this specimen, the left main coronary artery (black asteris... More about this image found in CORONARY ARTERIES: BASE OF THE HEART Base-of-heart depictions viewed from ...
Book Chapter
Series: Atlases of Tumor and Non-Tumor Pathology, Series 5
Volume: 19
Published: 01 February 2024
10.55418/9781933477428-15
ISBN-10: 1-933477-42-3
ISBN: 978-1-933477-42-8
... versus Other Melanoma Variants. The distinction from superficial spready, acral lentiginous, and lentigo maligna melanomas is based on the definition of nodular melanoma: no melanoma in situ extending beyond the periphery of the invasive melanoma. As previously discussed, this allows for overlap...
Book Chapter
Series: Atlases of Tumor and Non-Tumor Pathology, Series 5
Volume: 19
Published: 01 February 2024
10.55418/9781933477428-02
ISBN-10: 1-933477-42-3
ISBN: 978-1-933477-42-8
... based on expected size in adulthood (small [<1.5 cm], medium [1.6-20 cm], large [20-40 cm], and giant [40-60 cm])  Satellite nevi and neurocutaneous melanosis may be present Histopathologic Findings  Band-like architecture occupying the entire dermis  Extension into reticular dermis...
Book Chapter
Series: Atlases of Tumor and Non-Tumor Pathology, Series 5
Volume: 19
Published: 01 February 2024
10.55418/9781933477428-18
ISBN-10: 1-933477-42-3
ISBN: 978-1-933477-42-8
... be difficult based on light microscopic evidence alone. Not all blue melanomas have a high mitotic rate or display areas of necrosis. In some, the best diagnostic clues are expansile aggregates of epithelioid melanocytes or the presence of tumor overgrowth with loss of fibrous septa between fascicles of tumor...
Book Chapter
Series: Atlases of Tumor and Non-Tumor Pathology, Series 5
Volume: 19
Published: 01 February 2024
10.55418/9781933477428-20
ISBN-10: 1-933477-42-3
ISBN: 978-1-933477-42-8
... to diagnose a Spitz or spitzoid melanoma, such as asymmetry, poor circumscription, lack of maturation, marked nuclear atypia, and mitoses located near the base of the tumor. Nevertheless, there is significant overlap with atypical Spitz tumors. Ancillary studies are often needed for best tumor classification...
Book Chapter
Series: Atlases of Tumor and Non-Tumor Pathology, Series 5
Volume: 19
Published: 01 February 2024
10.55418/9781933477428-06
ISBN-10: 1-933477-42-3
ISBN: 978-1-933477-42-8
... the first 6 months after surgery ( 6 , 12 ). Dysplastic nevi may reappear later (after approximately 2 years, based on some studies [ 16 ]). Clinically, a persistent nevus manifests as repigmentation in a scar. After a shave procedure repigmentation is usually confined to within the area of the scar...
Book Chapter
Series: Atlases of Tumor and Non-Tumor Pathology, Series 5
Volume: 19
Published: 01 February 2024
10.55418/9781933477428-03
ISBN-10: 1-933477-42-3
ISBN: 978-1-933477-42-8
... in the stroma. Often this is accompanied by a morphologic change from large epithelioid melanocytes superficially to small epithelioid lymphocyte-like and fusiform schwannian (neural) ones at the base. These various cytomorphologies have been designated as type A (epithelioid), type B (lymphocyte like...
Book Chapter
Series: Atlases of Tumor and Non-Tumor Pathology, Series 5
Volume: 19
Published: 01 February 2024
10.55418/9781933477428-10
ISBN-10: 1-933477-42-3
ISBN: 978-1-933477-42-8
... more densely cellular aggregates in the midst or near the base of a lesion ( fig. 10-6 ). Rare mitotic figures may be seen. The Ki-67 labeling index is often slightly increased. This nevus has also been termed clonal or inverted type A nevus and melanocytic nevus with focal...
Book Chapter
Series: Atlases of Tumor and Non-Tumor Pathology, Series 5
Volume: 19
Published: 01 February 2024
10.55418/9781933477428-14
ISBN-10: 1-933477-42-3
ISBN: 978-1-933477-42-8
..., KRAS, EGFR, ERBB2, PIK3CA, and CRKL. Some mutations, such as those involving CRKL, are more common in acral melanomas than others ( 24 ). Based on sequence data, a small percentage of acral melanomas evolve in association with ultraviolet (UV) damage and BRAF...
Book Chapter
Series: Atlases of Tumor and Non-Tumor Pathology, Series 5
Volume: 19
Published: 01 February 2024
10.55418/9781933477428-09
ISBN-10: 1-933477-42-3
ISBN: 978-1-933477-42-8
... fig. 9-2C ). They may be placed within the pilar erector muscle (see fig. 9-2D ). In some, especially larger lesions, expansile aggregates with bulbous contours may be present at the base of the tumor (see fig. 9-2A ). DPN also commonly displays fascicles of melanocytes following neurovascular...
Images
LEFT VENTRICULAR DIVISIONS  The <span class="search-highlight">base</span>-apex length is di vided into thirds. T...
Published: 15 November 2023
LEFT VENTRICULAR DIVISIONS Figure 1-6 LEFT VENTRICULAR DIVISIONS The base-apex length is di vided into thirds. The basal third cor responds to mitral leaflets and their tendinous cords, and the middle third contains the mitral papillary muscles. The apical third has no mitral components. More about this image found in LEFT VENTRICULAR DIVISIONS The base-apex length is di vided into thirds. T...
Images
CORONARY VEINS  Left: <span class="search-highlight">Base</span>-of-heart view, close-up, after unroofing of coro...
Published: 15 November 2023
CORONARY VEINS Figure 1-39 CORONARY VEINS Left: Base-of-heart view, close-up, after unroofing of coronary sinus. Valves within the coronary sinus. One cusp of Vieussens valve is shown, adjacent to the mid-portion of the posterior mitral leaflet. An unnamed valve (yellow arrow) is located at junct... More about this image found in CORONARY VEINS Left: Base-of-heart view, close-up, after unroofing of coro...