ATLAS OF HEAD AND NECK PATHOLOGY ACINIC CELL ADENOCARCINOMA
ACINIC CELL ADENOCARCINOMA
Acinic cell adenocarcinoma, a low grade malignant tumor, seen at any age but
most prevalent in mid-adult life, arises most commonly in the parotid gland. Even in
this site it is rare in comparison to other primary salivary gland neoplasms. The tumor
is generally small, slow growing and usually painless. Some are cystic and generally
they are encapsulated. Metastasis to regional lymph nodes may occur.
Microscopically, the most typical cell type (and the type for which the tumor is
named) is one that rather closely resembles the normal parotid serous acinar cell with
an abundant, very granular and basophilic cytoplasm and a dark, acinar nucleus.
Cellular pleomorphism and mitoses are absent. A prominent lymphoid component with
germinal centers may be present. Thin-walled vessels are prominent. Very small
psammoma-like bodies may be seen in an occasional specimen. The stroma is often
scant and may consist chiefly of delicate fibrovascular tissue, but occasionally dense
hyalinzation is encountered. Overall, the tumor has a rather benign appearance but
is malignant. Architectural patterns of growth include solid or sheet-like, papillary
and glandular.
Acinic cell adenocarcinoma, parotid; anastomosing
cords of cells with eosinophilic granular cytoplasm
(more typically basophilic) arranged in sheet forma-
tion. Microcystic areas are seen (small arrow).
Cytoplasm is usually basophilic and granular giving
an appearance not unlike that of the normal pa-
rotid. The stroma, usually scant, consists of thin
strands of fibrovascular tissue (large arrows).
table of contents previous next
ATLAS OF HEAD AND NECK PATHOLOGY ACINIC CELL ADENOCARCINOMA
Acinic cell adenocarcinoma. Same tumor nodular
pattern with tumor (double arrows) separated by
heavy bands of collagen. Microcysts are present and
there is a small area of normal parotid (single
arrow) which the tumor resembles more closely than
does any other malignant salivary gland neoplasm.
Acinic cell adenocarcinoma, clear cell variant. The
cytoplasm appears highly vacuolated with a faint
eosinophilic reticular appearance. Nuclei are small,
dark and dense, basally located.
table of contents previous next
ATLAS OF HEAD AND NECK PATHOLOGY ACINIC CELL ADENOCARCINOMA
Acinic cell adenocarcinoma, high power; psammoma-
like bodies (arrows) are occasionally seen. There are
vacuoles in most cells in this area. Note the granu-
larity of the cytoplasm and the very indistinct cellu-
lar outlines.
Acinic cell carcinoma; typical granular composition
that resembles normal parotid acinar cells.
table of contents previous next
ATLAS OF HEAD AND NECK PATHOLOGY ACINIC CELL ADENOCARCINOMA
CLINICAL ASPECTS:
The tumor is more common in women than men, slow-growing and ordinarily
painless. Preoperatively, most are thought to be mixed tumors. Five year survival
after surgical resection is about ninety percent but local recurrence is common and
then the best recourse is total parotidectomy since the recurrent tumor is not encap-
sulated. Five to ten percent of patients eventually die of their disease, usually after a
long course.
table of contents previous next
