Webster's New World Medical Dictionary

male internal genitalia
The internal genital
structures of the male that are concerned with
reproduction, including the testis, epididymis, duc-
tus deferens, seminal vesicle, ejaculatory duct, bul-
bourethral gland, and prostate.
male organs of reproduction
The sum total of
all the genital organs—internal and external—of
the male that are concerned with reproduction. See
also 
male external genitalia; male internal
genitalia.
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male organs of reproduction
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male pelvis
The lower part of the abdomen that
is located between the hip bones in a male. The
male pelvis is more robust, narrower, and taller
than the female pelvis. The angle of the male pubic
arch and the sacrum are narrower as well.
malformation
An abnormality in which the
development of a structure is arrested, delayed, or
misdirected early in embryonic life, and the effect is
permanent. See also 
congenital malformation.
malformation, arteriovenous
A malformation
of blood vessels in the brain, brainstem, or spinal
cord that is characterized by a complex tangled web
of abnormal arteries and veins connected by one
or more fistulas (abnormal communications).
Abbreviated AVM. An AVM has no capillary bed. The
fistulas in the AVM permit high-speed, high-flow
shunting of blood from the arterial to the venous
side of the circulation. This creates low pressure in
the arterial vessels feeding the AVM and neighboring
areas of the brain that they normally supply with
blood. If an AVM causes problems, it is usually
before the person who has it reaches age 40. The
most common symptoms include hemorrhaging
(bleeding), seizures, headaches, and neurological
problems such as paralysis or loss of speech, mem-
ory, or vision. Treatment for AVM may involve sur-
gery or closing off the vessels of the AVM by
nonsurgical means, using a catheter to deliver
agents that block the blood vessels. Most people
with AVMs never experience problems, but AVMs
that hemorrhage can lead to serious neurological
problems and sometimes death.
malignancy
A tumor that is malignant (cancer-
ous), that can invade and destroy nearby tissue, and
that may spread (metastasize) to other parts of the
body.